Royal Army College

Lesson Overview

Some injuries are hidden. A blow to the head, a fall that may have hurt the spine, a crush or impact to the body that may have damaged something inside, these can be as serious as any visible wound, sometimes more so, yet they may show little on the surface, and the wrong handling, above all the careless moving of a casualty with a possible spinal injury, can do terrible and lasting harm. The earlier lessons taught the care of bleeding, breathing, and the limbs; this lesson teaches the recognition and first-aid care of head, spinal, and internal injuries, the serious injuries to the head, the spine, and inside the body that a first-aider must recognise, handle rightly, and get urgently into the chain of care. It matters because these injuries are serious and easily under-rated, because a spinal injury handled carelessly can leave a casualty paralysed for life, and because the first-aider's recognising them and handling them rightly, even when little shows, can prevent grave harm. As throughout this course, the first-aider works within their scope: they recognise these injuries, give the basic protective first aid, handle the casualty rightly, and get them urgently into the chain of care, while their clinical treatment belongs to qualified medical staff and the hands-on handling skills are certified in person. This lesson teaches that: recognising head injury, recognising and protecting against spinal injury, and recognising internal injury, all within the first-aider's scope.

The lesson takes head, spinal, and internal injuries in three parts. First, head injury: recognising injury to the head and the brain, which may be serious though it shows little, the signs that matter, and the basic care and urgent summoning. Second, spinal injury: recognising the possibility of a spinal injury, the grave danger of moving such a casualty carelessly, and the protective handling, keeping the spine still, that prevents a paralysing harm. Third, internal injury: recognising injury inside the body, which may bleed or harm dangerously while showing little outside, the signs of hidden serious injury, and the urgent summoning it demands. Throughout, the lesson holds that head, spinal, and internal injuries are serious and easily under-rated because they may show little, that the spinal injury above all must be handled with great care to avoid a paralysing harm, and that the first-aider recognises, protects, and summons within scope while clinical treatment belongs to qualified staff.

By the end you will be able to recognise head injury and its signs and give the basic care; recognise the possibility of spinal injury, understand the danger of moving such a casualty, and handle them protectively to keep the spine still; recognise internal injury from its signs of hidden serious harm; summon urgently for all three; and explain the first-aider's scope and limits with these serious, often hidden injuries.

Key Terms

Hidden injury: a serious injury, to the head, spine, or inside the body, that may show little on the surface yet be grave, easily under-rated by the careless.
Head injury: injury to the head and the brain, which may be serious though little shows outside, recognised from its signs and treated with basic care and urgent summoning.
Spinal injury: injury to the spine, which can damage the spinal cord and cause paralysis, and which careless movement can turn from a recoverable injury into a permanent one.
Suspecting spinal injury: the recognition, from how the casualty was hurt and from the signs, that a spinal injury is possible, on which the protective handling depends.
Keeping the spine still: the protective handling of a casualty with a possible spinal injury, keeping the head, neck, and back in line and not moving them unnecessarily, to prevent further cord damage.
Internal injury: injury inside the body (to organs, or internal bleeding) which may be serious and bleed dangerously while showing little outside, recognised from its signs.
Internal bleeding: bleeding inside the body that cannot be seen or pressed on, dangerous because it is hidden and cannot be stopped by a first-aider, demanding urgent care.
The signs of hidden serious injury: the signs (such as the story of how the casualty was hurt, and the developing signs of shock or deterioration) that reveal a serious injury showing little outside.
Recognise, protect, summon: the first-aider's drill for these injuries, within scope, recognising them, giving basic protective care, and getting the casualty urgently into the chain of care.
The clinical limit: the boundary beyond which the treatment of head, spinal, and internal injuries belongs to qualified medical staff, the first-aider recognising, protecting, and summoning.

Head injury

The first of these serious injuries is the head injury: injury to the head and, within it, the brain. A blow to the head, a fall, an impact, can injure the brain, and brain injury can be very serious, even fatal, yet a head injury may show little on the surface, with no great wound and the casualty seeming, at first, not badly hurt. This is the danger of head injury: it is easily under-rated, because the seriousness is inside the skull where it cannot be seen, and a casualty who seems only dazed may have a serious and worsening brain injury. So the first-aider learns to take any significant blow to the head seriously and to recognise the signs of head injury.

The first-aider recognises head injury from how the casualty was hurt and from the signs. A significant blow to the head, a hard fall, an impact, raises the suspicion of head injury whatever the surface shows. The signs to watch for include altered consciousness, the casualty knocked out, dazed, confused, drowsy, or behaving oddly; worsening over time, the casualty getting more drowsy, confused, or less responsive, which is a danger sign of a worsening brain injury; severe or worsening headache, repeated vomiting, and other signs of a brain under pressure; and any obvious injury to the head, though, as stressed, serious head injury can show little outside. The most important single thing the first-aider watches for is deterioration, the casualty getting worse over time, drowsier, more confused, less responsive, because a brain injury that worsens is a grave emergency, and the casualty who seemed only dazed but is steadily declining needs urgent medical care. The basic first-aid care of a head injury within scope is to manage the casualty by the systematic approach, keeping the airway open and breathing going (a head-injured casualty may have a threatened airway), protecting them, monitoring their level of consciousness for deterioration, and, above all, getting them urgently into the chain of care, because serious head injury needs medical care the first-aider cannot give. A head injury is also often accompanied by possible spinal injury (the same blow or fall may have hurt the neck), so the first-aider treats a serious head injury as a possible spinal injury too, handling accordingly, as the next section teaches. The first-aider's part with head injury is therefore to recognise it, take it seriously even when little shows, give the basic protective care, watch for deterioration, and summon urgently, the recognise-protect-summon drill within scope, while the treatment of the brain injury belongs to qualified medical staff.

   HEAD INJURY

   a blow/fall/impact can injure the BRAIN -- serious, even fatal -- yet may
   show LITTLE outside (no great wound; casualty seems not badly hurt).
   -> the danger: easily UNDER-RATED (the seriousness is inside the skull).
   take any significant blow to the head SERIOUSLY.

   RECOGNISE from how they were hurt + the SIGNS:
     ALTERED CONSCIOUSNESS (knocked out, dazed, confused, drowsy, odd)
     WORSENING OVER TIME (more drowsy/confused/less responsive) -- the key
        danger sign of a worsening brain injury
     severe/worsening HEADACHE, repeated VOMITING; obvious head injury
   watch above all for DETERIORATION (getting worse over time).

   BASIC CARE (within scope): systematic approach -- airway + breathing,
   protect, MONITOR consciousness for deterioration, SUMMON urgently.
   treat a serious head injury as a POSSIBLE SPINAL injury too (same blow).
   -> recognise, protect, summon. brain-injury treatment = qualified staff.

Spinal injury

The second and in one way the most critical of these injuries is the spinal injury, because here the first-aider's handling itself can make the difference between recovery and permanent harm. An injury to the spine can damage the spinal cord, the great nerve that runs down the back, and damage to the cord can cause paralysis, the loss of movement and feeling below the injury, which may be permanent. The terrible danger, and the reason spinal injury demands such care, is that a casualty with an injured spine but an undamaged or only partly damaged cord can be turned into a permanently paralysed casualty by careless movement: moving such a casualty wrongly, bending or twisting the injured spine, can complete the cord damage that the injury had not, turning a recoverable injury into a lifelong paralysis. So the careless moving of a casualty with a possible spinal injury is one of the worst things a first-aider can do, and the protective handling of such a casualty is among the most important things this course teaches.

Because the handling depends on it, the first-aider must suspect spinal injury when it is possible, from how the casualty was hurt and from the signs. The mechanism is the chief clue: a fall from a height, a hard impact, a blow to the head or back, a vehicle accident, any force that could have wrenched or impacted the spine, raises the suspicion of spinal injury whatever the casualty says, because a spinal injury does not always announce itself. Signs that may be present include pain in the neck or back, numbness, tingling, or weakness in the limbs, or an inability to move parts of the body, but these may be absent or hidden by other injuries, so the first-aider does not wait for clear signs: where the mechanism could have caused a spinal injury, they suspect one and handle the casualty accordingly. This is the key principle: suspect spinal injury from the mechanism, and treat as a spinal injury when in doubt, because the cost of handling a non-spinal casualty as spinal is small, while the cost of handling a spinal casualty as non-spinal can be permanent paralysis. The protective handling is to keep the spine still: keeping the head, neck, and back in line and not moving them unnecessarily, so the injured spine is not bent or twisted. The first-aider, suspecting spinal injury, avoids moving the casualty unless they must (to manage a swift killer, or to get them out of immediate danger), and where the casualty must be handled or moved, keeps the head, neck, and back in line and supported, ideally moving them as little as possible and with help, keeping the whole spine straight and still. The detailed hands-on skills of spinal immobilisation and the safe moving of a spinal casualty are taught and certified in person and connect to the moving-the-casualty lesson, which teaches keeping the head and spine in line in the handling and moving of a casualty; here the first-aider learns the recognition and the principle: suspect spinal injury, keep the spine still, do not move unnecessarily, and summon urgently. The one overriding exception, which the course holds throughout, is that the swift killers come first: if a casualty with a possible spinal injury is not breathing or has a catastrophic bleed, the first-aider deals with the immediate threat to life, taking as much care of the spine as the life-saving allows, because a casualty who dies of a blocked airway is not helped by a protected spine. But short of that, the first-aider protects the possible spinal injury with great care. So the first-aider's part with spinal injury is to suspect it from the mechanism, keep the spine still, not move the casualty unnecessarily, deal with any swift killer while protecting the spine as far as possible, and summon urgently, recognising that careless handling can cause permanent paralysis and that protective handling can prevent it.

   SPINAL INJURY (where your HANDLING can decide recovery vs permanent harm)

   injury to the spine can damage the SPINAL CORD -> PARALYSIS (loss of
   movement + feeling below the injury), possibly permanent.
   THE TERRIBLE DANGER: careless MOVEMENT can turn a recoverable injury into
   permanent paralysis (bending/twisting completes the cord damage).
   -> careless moving of a possible spinal casualty = one of the worst things
      a first-aider can do.

   SUSPECT spinal injury from the MECHANISM (fall from height, hard impact,
   blow to head/back, vehicle accident) -- whatever the casualty says.
   signs (may be ABSENT): neck/back pain, numbness/tingling/weakness, can't
   move parts. -> when in doubt, TREAT AS spinal (cost of caution is small;
   cost of missing it is permanent paralysis).

   PROTECTIVE HANDLING: KEEP THE SPINE STILL -- head, neck, back IN LINE; do
   NOT move unnecessarily; if you must handle/move, keep the whole spine
   straight + supported, as little as possible, with help.
   EXCEPTION: SWIFT KILLERS FIRST -- not breathing / catastrophic bleed ->
   treat the threat to life, sparing the spine as far as the life-saving allows.
   -> suspect, keep still, don't move needlessly, summon urgently.

Internal injury

The third of these serious, often hidden injuries is internal injury: injury inside the body, to the organs or causing bleeding within, that may be grave while showing little on the surface. A crush, a hard impact, a heavy blow to the body can damage organs or cause internal bleeding, bleeding inside the body that cannot be seen, and this can be as dangerous as a visible wound, sometimes more so, precisely because it is hidden. Internal bleeding is especially dangerous to a first-aider because it cannot be seen and cannot be pressed on or packed as an external bleed can: the first-aider cannot stop internal bleeding, which goes on inside while the casualty bleeds toward shock, so internal injury is a grave emergency that the first-aider can recognise and summon for but not treat. So the first-aider learns to recognise internal injury, even when little shows outside.

The first-aider recognises internal injury from how the casualty was hurt and from the signs of hidden serious harm. The mechanism is again a key clue: a crush, a hard impact, a heavy blow to the chest, abdomen, or body, raises the suspicion of internal injury whatever the surface shows. The signs include pain, tenderness, swelling, or bruising over the injured area; the developing signs of shock (which the circulation-and-shock lesson taught), the casualty becoming pale, cold, clammy, with a fast pulse and rapid breathing, without an obvious external bleed to explain it, which points to bleeding somewhere hidden; and the casualty deteriorating without a visible cause. The crucial recognition is the casualty who is getting worse, or showing shock, without an external injury that accounts for it, because that points to serious injury inside, and a casualty bleeding internally may show only the signs of shock and the story of a heavy impact. The first-aider's care of internal injury is within a narrow scope, because they cannot treat the injury itself: they manage the casualty by the systematic approach, treat for shock as the course taught (positioning, warmth, reassurance, though they cannot replace the lost blood), monitor for deterioration, handle the casualty gently, and, above all, get them urgently into the chain of care, because internal injury needs the medical and surgical care the first-aider cannot give and time matters greatly. The first-aider recognises the seriousness, does what little they can within scope, and summons urgently, understanding that the casualty's life depends on reaching medical care. So the first-aider's part with internal injury is to recognise it from the mechanism and the signs of hidden serious harm, treat for shock and manage the casualty within scope, and summon urgently, while the treatment belongs entirely to qualified medical staff. Taken with head and spinal injury, internal injury completes the lesson's theme: serious injuries that may show little, easily under-rated, demanding that the first-aider recognise them despite the lack of obvious signs, handle them rightly (above all the spinal injury, where handling decides the outcome), give what basic protective care is within scope, and get the casualty urgently into the chain of care, while their clinical treatment belongs to qualified medical staff. As throughout this course, this is the knowledge layer; the hands-on handling skills are certified in person, and all clinical treatment beyond basic first aid belongs to qualified medical staff.

In Practice: The Casualty Who Seemed Only Dazed

A first-aider of the Royal Kaharagian Army reaches a casualty who has fallen a height onto hard ground, and the case shows this lesson's theme: the serious injury that shows little. The casualty is conscious and seems, at first, only dazed, with no great visible wound, and a careless carer might think them not badly hurt. The first-aider knows better. They deal first with any swift killers by the systematic approach, then recognise, from the mechanism of a fall from a height, the strong possibility of serious hidden injury, to the head, the spine, and inside the body, whatever the surface shows.

They recognise and care for the head injury: noting the casualty was dazed, they monitor the level of consciousness closely for deterioration, the key danger sign, ready to summon all the more urgently if the casualty grows drowsier or more confused, and they keep the airway and breathing protected. They suspect spinal injury from the mechanism, the fall from a height that could have wrenched the spine, and do not wait for clear signs: they handle the casualty as a spinal injury, keeping the head, neck, and back in line, not moving them unnecessarily, and where they must be handled, keeping the whole spine straight and supported with help, because they know that careless movement could turn a recoverable injury into permanent paralysis. And they watch for internal injury: alert to the signs of shock developing without an external bleed to explain it, which would point to bleeding inside, they treat for shock within scope and monitor for deterioration. Above all, recognising that all three of these serious injuries need medical care they cannot give, they get the casualty urgently into the chain of care.

The value is a casualty whose serious, hidden injuries were recognised and rightly handled, where a careless carer would have under-rated the dazed casualty, perhaps moved them carelessly and risked paralysing them, and missed the deterioration or the internal bleed. Because the first-aider took the mechanism seriously, recognised the possible head, spinal, and internal injuries despite the little that showed, handled the casualty protectively (above all keeping the spine still), gave the basic protective care within scope, and summoned urgently, they prevented grave harm and got the casualty to the care they needed. They held the clinical limit, recognising, protecting, and summoning rather than attempting treatment beyond their training. This first-aider understood that head, spinal, and internal injuries are serious and easily under-rated because they may show little, that the spinal injury above all must be handled with great care, and that the first-aider recognises, protects, and summons within scope, which is the whole of this lesson.

Check Your Understanding

Explain why head injury is "easily under-rated," the signs the first-aider watches for (above all deterioration over time), and the basic care within scope. Why is a serious head injury also treated as a possible spinal injury?
Explain the danger of spinal injury and why "careless movement can turn a recoverable injury into permanent paralysis." Why does the first-aider suspect spinal injury from the mechanism and treat as spinal when in doubt, and how do they keep the spine still? What is the one overriding exception?
Explain how the first-aider recognises internal injury despite little showing outside, including the signs of shock without an external bleed. Why can the first-aider not treat internal bleeding, and what is their part (recognise, treat for shock within scope, summon urgently)?

Reflection (write a short paragraph): This lesson teaches that some of the most serious injuries, to the head, the spine, and inside the body, may show little on the surface and are easily under-rated, and that the careless moving of a casualty with a possible spinal injury can paralyse them for life. Think about why a casualty who seems only dazed, or who has no visible wound, may in fact be gravely injured, and why suspecting these injuries from how the casualty was hurt, rather than waiting for obvious signs, matters so much. What would it take to recognise and rightly handle these hidden serious injuries within your scope, above all to keep a possible spinal injury still and get the casualty urgently into the chain of care?

Summary

Head, spinal, and internal injuries are serious injuries that may show little on the surface and are easily under-rated, and the wrong handling, above all the careless moving of a possible spinal injury, can do terrible and lasting harm. The first-aider recognises them despite the little that shows, handles them rightly, gives basic protective care within scope, and summons urgently.
Head injury (injury to the brain) may be serious though little shows: recognised from a significant blow and from signs of altered consciousness, worsening over time (the key danger sign), severe headache, and vomiting. The basic care is the systematic approach, protecting the airway, monitoring consciousness for deterioration, and urgent summoning; a serious head injury is also treated as a possible spinal injury.
Spinal injury can damage the cord and cause paralysis, and careless movement can turn a recoverable injury into permanent paralysis, so it is the injury where handling most decides the outcome. The first-aider suspects spinal injury from the mechanism (fall from height, hard impact, blow to head or back), treats as spinal when in doubt, keeps the spine still (head, neck, and back in line, not moving unnecessarily), and summons urgently. The one exception is that the swift killers come first, sparing the spine as far as the life-saving allows.
Internal injury (to organs or internal bleeding) may be grave while showing little: recognised from the mechanism (crush, hard impact) and the signs of hidden serious harm, above all shock developing without an external bleed to explain it. The first-aider cannot stop internal bleeding, so they treat for shock and manage the casualty within scope, monitor for deterioration, and summon urgently.
The theme throughout is the serious injury that may show little: the first-aider recognises it despite the lack of obvious signs, handles it rightly (above all the spinal injury), gives basic protective care, and summons urgently, while clinical treatment belongs to qualified medical staff.
This is the knowledge layer; the hands-on handling skills are certified in person, and all clinical treatment beyond basic first aid belongs to qualified medical staff.
Cross-references: builds on the systematic approach (Lesson 02), the airway and breathing (Lesson 04), and the circulation and shock (Lesson 05); the keeping of the spine still in handling and moving is taught hands-on in Moving the Casualty and the Chain of Care (Lesson 07); the care is sustained over a long wait in Prolonged and Austere Casualty Care (Lesson 15); and these injuries are taken further at the team-medic level in Team Medic and Advanced Casualty Care (MED 310).

Head, Spinal, and Internal Injuries