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Mount Rainier Medical Guide: Warning Signs, Treatment & Emergency Resources | Global Summit Guide
Mount Rainier · Medical Guide

Rainier Medical Guide: Warning Signs, Treatment & Emergency Resources

Altitude illness, hypothermia, frostbite, and heat illness — know the warning signs before you rope up. Written by a Registered Nurse for climbers at every level.

RN · Clinical Review Medical content reviewed by a Registered Nurse with wilderness medicine background
Altitude illness Medical kit checklist
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Medical Disclaimer. This page is written by a Registered Nurse and is intended for general informational and educational purposes only. It does not constitute professional medical advice, diagnosis, or treatment, and is not a substitute for guidance from a licensed physician or qualified wilderness medicine provider. Individual health conditions, medication interactions, and on-mountain circumstances vary — always consult your doctor before any high-altitude expedition and discuss your personal risk factors, medications, and emergency protocols. In a life-threatening emergency, call your local emergency services immediately. Medical guidelines and wilderness medicine protocols evolve; readers should verify current recommendations with qualified professionals. Global Summit Guide and its contributors assume no liability for decisions made based on the information on this page. Last reviewed: April 2026.

Mount Rainier’s summit sits at 14,411 feet — high enough for genuine altitude illness, cold enough for frostbite in July, and remote enough that evacuation can take hours. As an RN, the most important thing I can tell you is this: knowing the warning signs before the climb is what saves lives. By the time symptoms are severe, your decision-making is already compromised by altitude, fatigue, or cold. Read this before you go.

Rainier’s Three Medical Risk Zones

Your risk profile changes significantly as you gain elevation. Understanding what you’re climbing into at each stage helps you monitor yourself and your teammates accurately.

5,400 ft
Paradise Trailhead
Start elevation. Heat illness and dehydration are the primary concerns on approach. AMS risk is minimal at this level.
10,188 ft
Camp Muir
Where most climbers sleep before the summit push. AMS symptoms are common here. Acclimatize before ascending further.
14,411 ft
Columbia Crest
Genuine high altitude. Hypoxia is significant. HACE and HAPE risk exists. Cold injury risk is high in all seasons.

Altitude Illness: AMS, HACE & HAPE

Altitude illness is a spectrum, not a single condition. It progresses — and at Rainier’s summit elevation, all three forms are possible. The Lake Louise Score (LLS) is the standard field assessment tool: score yourself and your team at each camp.

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Diamox (Acetazolamide) — Talk to Your Doctor Before the Climb

Acetazolamide 125–250 mg twice daily, starting 24 hours before ascent, is the best-studied medication for AMS prevention. It works by stimulating faster breathing, helping your body adapt. It requires a prescription. Side effects include increased urination and tingling in the fingers — both expected and harmless. Do not take it if you’re allergic to sulfonamides. Ibuprofen 600 mg three times daily has also shown efficacy in some studies, but is not a substitute for proper acclimatization.

Stage 1 — Mild

Acute Mountain Sickness (AMS)

AMS is the body’s initial protest to reduced oxygen. It typically appears 6–12 hours after arriving at a new elevation and often improves with rest and hydration alone. The defining symptom is headache — without it, you don’t have AMS by definition.

Headache (required) Fatigue Nausea or vomiting Dizziness Poor sleep Loss of appetite Stop ascending Rest and hydrate Ibuprofen 400–600 mg for headache Reassess in 4–6 hours If improving: may hold altitude
Stage 2 — Serious

High Altitude Cerebral Edema (HACE)

HACE is AMS that has progressed to brain swelling. It is a medical emergency. The hallmark sign is ataxia — loss of coordination. Test your climbing partners with a simple heel-to-toe walk on a flat surface. If they can’t walk a straight line, HACE must be assumed. Do not wait for other symptoms to develop.

Severe headache (not relieved by ibuprofen) Ataxia — cannot walk heel-to-toe Confusion or altered behavior Extreme fatigue Vomiting Drowsiness or difficulty staying awake Descend IMMEDIATELY — every foot counts Dexamethasone 8 mg (if carried), then 4 mg q6h Supplemental oxygen if available Gamow bag if available 911 — request helicopter evacuation
Stage 3 — Life-Threatening

High Altitude Pulmonary Edema (HAPE)

HAPE is fluid accumulating in the lungs. It is the leading cause of altitude-related death and can kill within hours if descent is delayed. Critically, it can occur without preceding AMS symptoms — especially in people who ascend rapidly or have had HAPE before. Listen for a persistent cough, and watch for any pinkish or frothy sputum. These are dire signs.

Decreased exercise tolerance (falling behind) Dry cough that becomes wet/productive Shortness of breath at rest Pink or frothy sputum Crackling sound when breathing (rales) Cyanosis — blue lips or fingertips Descend IMMEDIATELY — do not wait for morning Nifedipine 30 mg extended-release (if carried) High-flow supplemental oxygen — 4–6 L/min Minimize exertion — carry patient if necessary 911 — this is a critical emergency
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The Cardinal Rule of Altitude Illness

Never ascend with symptoms of AMS. If symptoms worsen or don’t improve after 24 hours at the same elevation, descend. Any sign of HACE or HAPE means immediate descent regardless of time, weather, or how close you are to the summit. A descended climber can recover. A summit at any cost can kill.

Hypothermia

Rainier’s weather changes rapidly. Wind, moisture, and temperatures well below freezing are possible on the upper mountain in any month. Hypothermia develops when core temperature drops below 95°F (35°C). The dangerous part: as it progresses, the victim stops feeling cold and loses the judgment to self-rescue.

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Hypothermia

Core temp below 95°F (35°C) — can occur in above-freezing temperatures with wind and moisture
Mild (95–90°F)
Shivering — this is still protective
Slurred speech
Clumsiness, stumbling
Confusion, poor decisions
Skin pale and cold
Moderate–Severe (below 90°F)
Shivering stops — serious sign
Muscle stiffness
Drowsiness or unconsciousness
Weak, irregular pulse
“Paradoxical undressing” — removes clothing
Field Treatment
Move out of wind and wet immediately
Remove wet clothing, insulate from ground
Apply heat packs to armpits, groin, neck
Warm, sweet drinks if alert and able to swallow
Body-to-body warming in sleeping bag
Severe: handle gently — cardiac arrest risk
When to Call for Evacuation

If shivering has stopped, the patient is confused or unconscious, or warming efforts don’t improve the situation within 30 minutes, call 911 immediately. Handle severe hypothermia patients gently — rough movement can trigger fatal ventricular fibrillation. “They’re not dead until they’re warm and dead” — resuscitation efforts should continue even in apparently pulseless patients during evacuation.

Frostbite & Frostnip

Wind chill on Rainier’s upper mountain can drop effective temperatures well below 0°F. Fingers, toes, nose, cheeks, and ears are most vulnerable — check your partners’ faces regularly, and buddy-check extremities during rest stops. You cannot feel your own frostbite once it develops.

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Frostbite & Frostnip

Nose, ears, cheeks, fingers, toes — check each other; you cannot feel your own
Frostnip (Superficial, Reversible)
Skin red, then white or gray
Numbness or tingling
Skin still soft when touched
Rewarm with body heat immediately
Tingling and redness on rewarming is expected
True Frostbite (Tissue Damage)
Skin waxy, yellow-white, or gray
Skin hard or wooden to the touch
Complete numbness — no pain
Blisters may form after rewarming
Tissue may appear mottled or purple-black
Critical Field Rules
Do NOT rewarm if refreezing is possible
Do NOT rub frostbitten tissue
Do NOT walk on frostbitten feet if avoidable
Rapid rewarming in 99–102°F water if shelter secured
Ibuprofen 400 mg to reduce tissue damage
Hospital Required

True frostbite requires hospital evaluation even if rewarmed in the field. Do not pop blisters. Tissue that looks black may still be viable — definitive assessment takes days to weeks. Modern treatment with tPA (clot-busting medication) must be initiated within 24 hours at a hospital for deep frostbite, so descent and evacuation are time-sensitive.

Heat Exhaustion & Heat Stroke

This surprises many climbers, but heat illness is a real risk on Rainier’s lower slopes — especially on sunny summer days on the snowfields below Camp Muir. UV intensity is extreme at altitude (snow reflects up to 80% of UV radiation), and climbers often overdress in layers that trap heat during the approach.

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Heat Exhaustion & Heat Stroke

Most common on the Paradise to Camp Muir approach on bright summer days — do not underestimate
Heat Exhaustion (Warning)
Heavy sweating
Weakness and fatigue
Cool, pale, clammy skin
Nausea, possible vomiting
Headache and dizziness
Fast, weak pulse
Heat Stroke (Emergency)
Body temperature above 104°F
Hot, red, dry or damp skin
Rapid, strong pulse
Confusion, altered mental status
Unconsciousness
Seizure
Treatment
Move to shade or cool area immediately
Remove excess clothing
Cool with water, snow, or damp cloth
Fan the patient
Oral fluids if alert and able to swallow
Heat stroke: 911 immediately — this is a critical emergency
Prevention Note from a Nurse

Sunscreen is not optional — it’s medical. Apply SPF 50+ to all exposed skin including under your chin (snow reflects UV upward), reapply every 90 minutes, and protect your lips. Sunburn at altitude is severe and fast. Hydration target: 0.5–1 liter per hour while climbing. Don’t wait until you’re thirsty — thirst arrives late at altitude.

What to Pack: Your Rainier Medical Kit

Every climber should carry a personal kit. Your guide team will carry group emergency supplies, but you are responsible for your own medications, blister care, and personal medications. This is the kit I’d take to Camp Muir and above.

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Prescription Medications Require a Doctor’s Visit

Diamox, Dexamethasone, and Nifedipine are prescription drugs in the US. Schedule an appointment with your doctor 4–6 weeks before your climb to discuss altitude illness prevention and emergency medications. Bring your itinerary. Wilderness medicine clinics (WEMS, NOLS) offer pre-trip medical consultations.

Altitude Illness

Altitude Medications

Acetazolamide (Diamox) 125–250 mg tablets — Rx required, for prevention
Dexamethasone 4 mg tablets or injectable — Rx required, HACE emergency
Nifedipine 30 mg extended-release — Rx required, HAPE emergency
Ibuprofen 400–600 mg — for AMS headache; also shows prevention benefit
Ondansetron (Zofran) orally-dissolving tabs — for severe nausea/vomiting at altitude
Pain & Fever

Analgesics & Anti-Inflammatories

Ibuprofen 400–600 mg — primary pain reliever; anti-inflammatory benefit
Acetaminophen 500–1000 mg — alternative if GI-sensitive; safer at altitude for some
Aspirin 325 mg — useful in cardiac events; also mild headache relief
Wound Care

Blister & Wound Management

Moleskin and Leukotape — prevent and manage blisters; tape before hot spots form
Antiseptic wipes — wound cleaning in the field
Steri-strips and butterfly closures — laceration closure
Non-adherent gauze pads (2×2 and 4×4) — wound dressing
Medical tape (1 inch) — securing dressings
Bacitracin ointment — wound infection prevention
Cold Injury & Skin

Cold & Sun Protection

Sunscreen SPF 50+ — apply before leaving camp, reapply q90 min
SPF lip balm 30+ — lips burn severely on snowfields
Chemical heat packs (6–8 pairs) — frostnip treatment, hand warmers in gloves
Aloe vera gel — sunburn and skin irritation
Emergency space blanket — hypothermia first response
GI & Hydration

GI & Hydration Support

Electrolyte packets — Nuun, Liquid IV, or equivalent; critical for hydration at altitude
Antacids — acid reflux worsens at altitude
Loperamide (Imodium) — GI illness at elevation is dangerous; control diarrhea
Bismuth subsalicylate — GI upset, mild nausea
Tools & Assessment

Field Assessment Tools

Pulse oximeter — monitor O₂ saturation at altitude; trends matter more than single readings
Digital thermometer — confirm hypothermia, fever
SAM splint — ankle, wrist, or finger immobilization
Medical gloves (nitrile) — multiple pairs; cold destroys latex
Trauma shears — cutting through layers without causing further injury
Emergency contact card — laminated, in outer pocket
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Carry a Satellite Communication Device

Cell coverage above Paradise is unreliable and often nonexistent. A Garmin inReach, SPOT, or similar satellite device lets you call for rescue from anywhere on the mountain regardless of cell signal. This is not optional for anyone climbing above Camp Muir. Pre-register with park rangers and ensure your team knows how to operate the device.

Nearest Medical Facilities

There is no hospital or urgent care clinic inside Mount Rainier National Park. Ranger stations at Paradise and Sunrise have emergency response staff with Wilderness First Responder or EMT training, but complex medical care requires evacuation. Know where you’re going before you need it.

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In-Park Emergency: (360) 569-6600 — Save This Number Now

This is the Mount Rainier National Park dispatch line for search and rescue. If you have cell signal, call this number before calling 911 — park rangers coordinate ground and air rescue on the mountain. With a satellite device, the SOS function connects to GEOS, which will coordinate with park rescue teams. Weather permitting, helicopter evacuation typically reaches Camp Muir within 30–60 minutes.

Facility Location From Paradise Level / Services Phone
St. Anthony Hospital 801 Hospital Drive, Enumclaw, WA 98022 ~40 miles Full ER · Closest to mountain · Trauma-capable (360) 802-8800
MultiCare Auburn Medical Center 202 N Division St, Auburn, WA 98001 ~55 miles Full ER · Larger facility · Regional trauma center (253) 833-7711
Providence Regional Medical Center 1321 Colby Ave, Everett, WA 98201 ~85 miles Level II Trauma Center · Hyperbaric chamber (425) 261-2000
Harborview Medical Center 325 9th Ave, Seattle, WA 98104 ~90 miles Level I Trauma — Pacific NW’s highest acuity center (206) 744-3000
Paradise Visitor Center (Ranger Station) Mount Rainier National Park On-mountain WFR/EMT staff · Rescue coordination · Basic first aid (360) 569-6600

Hyperbaric oxygen therapy — relevant if you are evacuated with significant frostbite or altitude-related tissue injury — is available at Virginia Mason Medical Center in Seattle and at some dive centers in the region. Confirm availability by calling ahead, as chambers may not always be staffed.

Final Word — From a Nurse

The Summit Is Optional. Getting Down Is Not.

Every one of the conditions on this page is survivable with early recognition and appropriate action. Every one can be fatal if ignored or minimized. Learn the signs, discuss them with your team before departure, assign someone the job of checking in on teammates at each rest stop, and agree in advance on the conditions under which you’ll turn around. That conversation — before the climb — is the most important medical intervention of your trip.

Acclimatization guide Full Rainier guide