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Health and First Aid

HEALTH AND FIRST AID

February 2, 2026 11 min read

In the wilderness, a minor injury becomes major if improperly treated. Knowledge and preparation mean the difference between inconvenience and catastrophe.

Introduction

Medical emergencies in the wilderness differ fundamentally from urban contexts. No ambulance arrives in minutes. No hospital provides advanced care. You and your party are the first, last, and often only responders for hours or days. This reality demands higher first aid competence than urban life requires.

This chapter addresses wilderness first aid: kit composition and improvisation, treatment protocols for common injuries, recognition and management of hypothermia and hyperthermia, and evacuation procedures when self-rescue fails. We emphasize practical, achievable interventions using limited resources.

Critical disclaimer: This chapter provides information, not medical training. Proper wilderness first aid requires hands-on instruction from qualified instructors. Take a WFA (Wilderness First Aid) or WFR (Wilderness First Responder) course. Reading is not substitute for training.

Field First Aid Kit

First aid kit balances comprehensiveness with weight and space constraints. Tailor contents to trip duration, group size, remoteness, and known medical conditions.

Minimal Kit (Day Trip, 1-2 People)

Wound care:

  • Adhesive plasters (various sizes)
  • Gauze pads (5x5cm, sterile)
  • Medical tape (cloth tape better than paper)
  • Antiseptic wipes
  • Blister treatment (moleskin or hydrocolloid dressings)

Medications:

  • Pain relief (ibuprofen and paracetamol)
  • Antihistamine (for allergic reactions, insect bites)
  • Anti-diarrheal (loperamide)
  • Personal prescription medications

Tools:

  • Tweezers (tick removal, splinters)
  • Safety pins
  • Small scissors or knife
  • Disposable gloves (nitrile)

Other:

  • Emergency contact information
  • Personal medical information sheet
  • Whistle (signaling)

Extended Kit (Multi-day Trip, Larger Group)

Add to minimal kit:

Wound care:

  • Larger gauze pads (10x10cm)
  • Conforming bandages (roller gauze)
  • Triangular bandage (sling, bandaging)
  • Wound closure strips (Steri-Strips)
  • Irrigation syringe
  • Hemostatic gauze (bleeding control)

Medications:

  • Antibiotic ointment
  • Hydrocortisone cream (rashes, insect bites)
  • Oral rehydration salts
  • Anti-nausea medication
  • Aspirin (heart attack)
  • Epinephrine auto-injector (if anyone has severe allergy history)

Tools:

  • Trauma shears (cutting clothing)
  • SAM splint (immobilization)
  • Elastic bandage (compression, support)
  • Emergency blanket (space blanket)
  • CPR face shield

Reference:

  • Wilderness first aid guide (compact reference card or small manual)

Improvisation When Kit Lacking

Bandages:

  • Clean clothing torn into strips
  • Sanitary pads (excellent absorbent dressings)
  • Tampons (bullet wounds historically—absorb blood, NOT recommended for modern first aid but desperate measure)

Splints:

  • Straight branches padded with clothing
  • Trekking poles
  • Sleeping pad cut to size

Sling:

  • Bandana
  • Jacket with sleeve pinned to chest
  • Belt

Cleaning wounds:

  • Boiled and cooled water
  • Cleanest available water (filtered if possible)

Antiseptic:

  • Honey (natural antibacterial)
  • Sphagnum moss (traditional wound dressing, antiseptic properties)
  • Avoid: Urine, alcohol, plant materials (unless specific knowledge)

Injuries and Acute Trauma

Bleeding Control

Minor bleeding:

  1. Apply direct pressure with clean cloth
  2. Elevate injured area above heart
  3. Maintain pressure 5-10 minutes
  4. Apply bandage once bleeding controlled

Severe bleeding (life-threatening):

Immediate actions:

  1. Direct pressure with hand/cloth
  2. Apply pressure dressing (gauze + tight bandage)
  3. If bleeding continues through dressing, add more dressing on top (don’t remove original)
  4. Pressure points (brachial artery for arm, femoral for leg)—compress artery between wound and heart

Tourniquet (last resort):

When to use:

  • Catastrophic limb bleeding not controlled by pressure
  • Multiple casualties requiring triage (tourniquet buys time)
  • Amputation or near-amputation

Application:

  1. Place 5-8cm above wound (not over joint)
  2. Use wide (4cm minimum) material—never wire or narrow cordage
  3. Tighten until bleeding stops
  4. Note time of application
  5. Do NOT loosen or remove (medical professional only)

Reality: Tourniquets carry risks (tissue damage, amputation) but prevent death from exsanguination. Life over limb.

Wound Cleaning and Closure

Cleaning:

  1. Irrigate with clean water (1-2 liters minimum for significant wounds)
  2. Remove visible debris
  3. Scrub gently if contaminated (inevitably painful)
  4. Pat dry with clean cloth

Closure options:

Minor wounds: Cover with adhesive plaster, keep clean and dry.

Larger wounds:

  • Wound closure strips (Steri-Strips) for wounds with clean edges
  • Butterfly bandages (improvise from medical tape)
  • Do NOT close: Deep punctures, animal bites, heavily contaminated wounds (infection risk)

Infection signs:

  • Increasing pain
  • Redness spreading from wound
  • Warmth
  • Pus or foul discharge
  • Red streaks extending from wound (lymphangitis—serious)
  • Fever

If infection develops: Keep clean, warm compresses, evacuate for antibiotics. Wilderness first aid cannot treat established infection adequately.

Fractures and Dislocations

Fracture signs:

  • Deformity
  • Severe pain
  • Swelling
  • Loss of function
  • Crepitus (grinding sensation)
  • Bruising

Open fracture: Bone protruding through skin. Medical emergency—infection risk enormous.

Treatment:

  1. Immobilize in position found (unless circulation compromised)
  2. Splint above and below fracture site
  3. Pad splint generously
  4. Check circulation distal to injury (pulses, color, sensation, movement)
  5. Elevate if possible
  6. Pain management (oral analgesics)
  7. Evacuate

Angulated fractures: If circulation compromised (no pulse below fracture, cold, blue limb), gentle traction and realignment may be necessary despite risk. This is advanced technique requiring training.

Dislocations:

Common sites: Shoulder, finger, patella (kneecap).

Field reduction (putting joint back):

  • Controversial in wilderness medicine
  • If hours/days from medical care AND circulation compromised, reduction may be necessary
  • Requires specific training
  • Risk of nerve/vessel damage
  • Document before attempting

Conservative approach: Immobilize in most comfortable position, pain management, evacuate.

Burns

Classification:

First-degree: Superficial, red, painful (sunburn).

Second-degree: Blistering, extremely painful.

Third-degree: Full thickness, may appear white or charred, LESS painful (nerves destroyed).

Treatment:

Immediate:

  1. Remove from heat source
  2. Cool with clean water (10-20 minutes)
  3. Remove jewelry, constrictive clothing (swelling occurs)
  4. Cover with clean, dry dressing
  5. Do NOT apply ice, butter, or ointments

Blisters: Leave intact (natural sterile dressing). If broken, treat as open wound.

Pain management: Oral analgesics, cool compresses.

Fluid loss: Major burns lose enormous fluid. Oral rehydration crucial.

Evacuation criteria:

  • Third-degree burns (any size)
  • Second-degree burns larger than palm of hand
  • Burns to face, hands, feet, genitals, major joints
  • Circumferential burns (encircling limb or torso)
  • Any burn in very young or very old
  • Inhalation injury suspected (smoke, confined space)

Sprains and Strains

RICE protocol:

R – Rest: Stop activity causing pain.

I – Ice: Cool injured area (cold water, snow if available) 20 minutes on, 20 off. Reduces swelling and pain.

C – Compression: Elastic bandage (not so tight it cuts circulation).

E – Elevation: Raise injured area above heart. Reduces swelling.

Return to activity: Gradually, as pain permits. Severe sprains require days of rest. Hiking out on severely sprained ankle risks permanent damage.

Bites and Stings

Insect stings:

  • Remove stinger if present (scrape, don’t squeeze)
  • Clean area
  • Cold compress
  • Antihistamine (oral)
  • Watch for allergic reaction

Anaphylaxis (severe allergic reaction):

  • Difficulty breathing, wheezing
  • Swelling of face/throat
  • Rapid pulse, dizziness
  • Treatment: Epinephrine auto-injector (EpiPen) IMMEDIATELY
  • Evacuate urgently even if symptoms improve

Snake bite (venomous):

  • Keep calm (reduces venom spread)
  • Immobilize limb
  • Remove jewelry
  • Do NOT: Cut wound, apply tourniquet, apply ice, try to suck venom
  • Identify snake if safe (aids treatment) but don’t risk second bite
  • Evacuate urgently
  • Antivenom only available at hospital

Tick removal:

  • Fine tweezers as close to skin as possible
  • Pull straight out with steady pressure
  • Clean area
  • Save tick in container with date/location
  • Monitor for Lyme disease signs (bull’s-eye rash, flu-like symptoms)

Environmental Illness

Hypothermia

Definition: Core body temperature drops below 35°C (95°F).

Stages:

Mild (35-32°C):

  • Shivering
  • Confusion, clumsiness
  • Slurred speech
  • Pale, cold skin
  • Still conscious and responsive

Moderate (32-28°C):

  • Violent shivering, then shivering stops
  • Severe confusion, irrational behavior
  • Drowsiness
  • Slow pulse and breathing
  • Loss of coordination

Severe (<28°C):

  • Unconsciousness
  • Rigid muscles
  • Barely detectable pulse/breathing
  • Appears dead (but may still be alive)

Treatment:

Mild hypothermia:

  1. Remove from cold environment
  2. Remove wet clothing
  3. Insulate from ground and elements
  4. Apply heat:
    • Warm, dry clothing
    • Warm drinks (if fully conscious)
    • Body-to-body contact in sleeping bag
    • Hot water bottles (wrapped, not direct contact)
  5. High-calorie food (if conscious and able to swallow)

Moderate to severe:

  1. Handle extremely gently (rough movement can trigger cardiac arrest)
  2. Remove from cold carefully
  3. Insulate horizontally (don’t make stand/walk)
  4. Warm trunk first (core), not extremities (warming extremities can drive cold blood to core—rewarming shock)
  5. Warm drinks if conscious and able to swallow
  6. Do NOT give alcohol or caffeine
  7. Monitor breathing and pulse continuously
  8. Evacuate urgently

“They’re not dead until they’re warm and dead”: Severe hypothermia mimics death. Continue resuscitation efforts longer than normally would.

Hyperthermia (Heat Illness)

Heat exhaustion:

Symptoms:

  • Heavy sweating
  • Weakness, dizziness
  • Nausea
  • Headache
  • Normal or slightly elevated temperature

Treatment:

  1. Move to shade/cool environment
  2. Rest
  3. Cool with wet cloths
  4. Drink cool water with electrolytes
  5. Should recover quickly

Heat stroke (MEDICAL EMERGENCY):

Symptoms:

  • Core temperature >40°C (104°F)
  • Altered mental status (confusion, aggression, unconsciousness)
  • Hot, DRY skin (sweating has stopped)
  • Rapid pulse
  • Seizures possible

Treatment:

  1. Immediate cooling (life-threatening)
    • Move to shade
    • Remove clothing
    • Wet skin, fan aggressively
    • Ice packs to neck, armpits, groin
    • Immerse in cold water if available
  2. Monitor temperature—cool to 38-39°C, then stop active cooling
  3. If conscious, sip water
  4. Evacuate urgently

Prevention:

  • Hydrate adequately
  • Avoid exertion during hottest part of day
  • Wear light, loose clothing
  • Take frequent breaks in shade
  • Acclimatize gradually to hot conditions

Altitude Illness

Acute Mountain Sickness (AMS):

Symptoms:

  • Headache
  • Nausea
  • Fatigue
  • Dizziness
  • Sleep disturbance

Onset: 6-12 hours after rapid ascent above 2,500m.

Treatment:

  • Stop ascending
  • Rest, hydrate
  • Mild analgesics for headache
  • If symptoms worsen, DESCEND

High Altitude Cerebral Edema (HACE):

Severe form—brain swelling. Confusion, ataxia (loss of coordination), loss of consciousness.

Treatment: IMMEDIATE descent. Life-threatening.

High Altitude Pulmonary Edema (HAPE):

Fluid in lungs. Breathlessness at rest, cough, weakness, chest tightness.

Treatment: IMMEDIATE descent, oxygen if available. Life-threatening.

Prevention:

  • Ascend gradually (“climb high, sleep low”)
  • Acclimatization days
  • Hydration
  • Recognize early symptoms and respond

Rescue and Evacuation

When to Evacuate

Immediate evacuation (hours):

  • Severe bleeding not controlled
  • Suspected internal injuries
  • Head injury with loss of consciousness
  • Spinal injury
  • Chest injuries affecting breathing
  • Severe allergic reaction
  • Hypothermia (moderate to severe)
  • Heat stroke
  • Severe altitude illness
  • Unstable fracture
  • Severe burns

Urgent evacuation (today):

  • Suspected fracture (stable)
  • Deep wound requiring closure
  • Persistent vomiting/diarrhea
  • High fever
  • Signs of serious infection
  • Significant pain not managed with available medication

Can wait (continue trip with modified plans):

  • Minor injuries well managed
  • Stable, improving conditions
  • Pain controlled
  • Full mobility or adequate work-around

Self-Evacuation

Walking wounded: If injured person can walk with assistance:

  • Fashio aid from trekking poles or improvised crutches
  • Two-person assist (one on each side)
  • Frequent rests
  • Monitor condition continuously

Improvised stretcher:

Construction:

  • Two long poles (2.5-3m)
  • Blanket, tarp, or multiple jackets
  • Thread poles through jacket sleeves or wrap material around poles

Carry:

  • Minimum four people (rotate frequently)
  • Additional person stabilizes head/neck if spinal concern
  • Extremely exhausting—expect slow progress (1km/hour or less)

Realistic assessment: Stretcher carry over rough terrain by untrained carriers is borderline impossible. Consider alternatives.

Signaling for Rescue

Ground-to-air signals:

  • Large X (assistance needed)
  • Large I (injured, send doctor)
  • Bright materials arranged in geometric patterns
  • Signal panels (orange visible from aircraft)

Sound signals:

  • Three blasts (whistle, gunshot) repeated periodically
  • Universal distress signal

Visual signals:

  • Signal mirror (can be seen 15+ km)
  • Fire with green vegetation (white smoke)
  • Flashlight at night (SOS pattern: · · · – – – · · ·)

Electronic:

  • Personal Locator Beacon (PLB)—satellite distress beacon
  • Satellite messenger (inReach, SPOT)
  • Mobile phone (limited coverage but improving)

Information for rescuers:

  • Exact location (coordinates if possible)
  • Number of people
  • Nature of injuries
  • Resources available (shelter, water, able-bodied helpers)
  • Marked location (smoke, signal panels)

Medical Training Recommendations

Minimum: Take wilderness first aid (WFA) course (16-20 hours). Covers basic injuries and illnesses specific to wilderness context.

Better: Wilderness First Responder (WFR) course (70-80 hours). Comprehensive training for extended wilderness scenarios.

Ongoing: Refresher courses every 2-3 years. Skills decay without practice.

Practice: Scenarios with your regular hiking/camping partners. Discuss “what if” situations.

Prevention: The Best Medicine

Physical preparation:

  • Fitness appropriate for planned activity
  • Gradual acclimatization
  • Listen to body’s warning signs

Mental preparation:

  • Know your limits
  • Turn back when conditions exceed capabilities
  • Ego kills—”summit fever” has caused countless preventable deaths

Equipment:

  • Proper footwear (prevent blisters, sprains)
  • Layered clothing (prevent hypothermia)
  • Adequate sun protection (prevent burns)
  • Properly fitting pack (prevent back injuries)

Nutrition and hydration:

  • Eat regularly (maintain energy, prevent bonking)
  • Drink before thirsty (prevent dehydration)
  • Electrolyte balance (prevent hyponatremia)

Risk management:

  • Conservative decision-making
  • Weather awareness
  • Route assessment
  • Contingency planning

Most wilderness medical emergencies are preventable. Preparation, judgment, and conservative risk assessment avoid the majority of problems.

Conclusion: Preparedness and Competence

Wilderness first aid differs from urban first aid in critical ways:

  • Extended time to definitive medical care
  • Limited resources and communication
  • Environmental challenges
  • Self-reliance imperative

Reading this chapter provides information. Competence requires training, practice, and experience. Take proper courses. Practice skills regularly. Update knowledge.

Carry adequate first aid supplies. Know how to use everything in your kit. Understand when to improvise and when improvisation is inadequate.

Make conservative decisions. Prevent injuries through preparation and judgment. When injuries occur, provide best care possible with available resources. Recognize when evacuation is necessary and execute safely.

Your life and your companions’ lives may depend on this knowledge. Take it seriously. Train properly. Practice regularly. Hope you never need it, but be prepared when you do.

The wilderness is unforgiving. Competent first aid makes the difference between manageable situation and tragedy.