What to Do When a Backpacking Headache Won't Go Away

A headache on the trail is easy to dismiss. You may blame a short night, a tight hip belt, too much sun, or the effort of climbing. Sometimes rest, food, and fluids solve it. Sometimes a headache is an early sign of heat illness, altitude illness, carbon monoxide exposure, infection, or another problem that won't improve by simply hiking through it.

The important question isn't only how to make the pain stop. It is whether continuing is sensible.

Stop and assess before you take another step

Tell your hiking partner that you have a headache, then stop somewhere safe and sit or lie down. If you are alone, move away from hazards such as a cliff edge, fast water, traffic, or a steep trail before assessing yourself.

Ask yourself:

• When did the headache begin?
• Did it follow hard exertion, heat, poor sleep, a fall, or a change in elevation?
• Is it getting better, worse, or staying the same?
• Have you been drinking and eating normally?
• Are you dizzy, confused, unusually weak, short of breath, nauseated, feverish, or having trouble seeing or walking?
• Has anyone else in your group developed a headache?

A quick check of your surroundings matters, too. If you used a stove, lantern, heater, or other fuel-burning device in or near a tent, vehicle, hut, or other enclosed space, move everyone into fresh air. Carbon monoxide is odourless and can cause headache, dizziness, weakness, nausea, confusion, and worse. Don't go back inside to investigate until the space has been properly ventilated and the source is dealt with.

Treat the common, reversible contributors

If you are alert, able to walk normally, and have no warning signs, start with a low-risk reset rather than pushing on.

Cool down and rest

Stop exerting yourself. Get into shade or a cool, well-ventilated place and loosen restrictive clothing and pack straps. In hot conditions, use cool, wet cloths on your neck or skin. Avoid wrapping yourself in extra layers if you feel overheated.

Heat can contribute to a headache even before more serious heat illness develops. If you are worsening, confused, faint, unable to drink, vomiting repeatedly, or becoming unusually drowsy, treat that as an emergency rather than a problem to solve with more water.

Drink steadily, not forcefully

Dehydration is one possible cause, particularly after sweating, vomiting, diarrhoea, or a long stretch without access to water. Sip fluids gradually and use a drink or food containing electrolytes if you have lost a lot of sweat or stomach fluid.

Don't force down large amounts of plain water. Overhydration can also be dangerous, especially when paired with strenuous exercise, and may cause headache, nausea, confusion, or worsening weakness. Your thirst, urine colour, weather, exertion, and recent losses all provide useful clues, but none gives a perfect diagnosis in the backcountry.

If you can't keep fluids down, or your symptoms are progressing despite rest and sensible drinking, stop trying to self-treat and arrange medical help.

Eat something familiar

Low food intake can add to fatigue and headache. Try a small, easy-to-digest snack with carbohydrates, such as a bar, crackers, dried fruit, or a meal you know sits well. If nausea is present, take small amounts rather than forcing a full meal.

Food isn't a substitute for assessment. A headache that remains severe after eating and resting deserves more attention, particularly if you have other symptoms.

Consider altitude and exertion

A headache after gaining elevation may be a symptom of acute mountain sickness, especially when it comes with nausea, dizziness, unusual tiredness, or poor sleep. It can occur in people who are fit and experienced, and fitness doesn't protect you from altitude illness.

Stop ascending while you assess the situation. Avoid alcohol and sleeping pills, which can complicate breathing and your ability to notice deterioration. Follow the advice of a qualified medical professional or an established altitude-medicine plan if you have one.

A worsening headache, confusion, difficulty walking straight, breathlessness at rest, a persistent cough, or unusual drowsiness at altitude isn't a “wait and see” situation. Descending is often the key treatment for serious altitude illness, but don't send a confused or severely unwell person down alone. Get the group organized, use emergency communication, and seek evacuation guidance.

Even without altitude, a headache after an unusually hard day may reflect overexertion, heat, poor sleep, or a developing illness. Reduce the day’s objective. The campsite or summit you planned is less important than getting everyone somewhere safe.

Check the route out before you need it: If the headache isn't clearly improving, confirm your map position, the nearest reliable exit, available communications, and the local search-and-rescue or emergency contact method. Regulations, coverage, and rescue procedures vary by region, so check current local information before your trip.

Be cautious with pain medication

Medication can make a manageable headache more comfortable, but it can also mask deterioration or create new problems when you are dehydrated, overheated, drinking alcohol, or taking other drugs.

Use only a medicine you have taken safely before, follow the package directions, and record what you took and when. Don't combine products that contain the same active ingredient. Check with a pharmacist or clinician before a trip if you have kidney, liver, stomach, bleeding, heart, or blood-pressure conditions, are pregnant, or take regular medication.

Common pain relievers aren't interchangeable. Anti-inflammatory medicines such as ibuprofen or naproxen may be unsuitable with dehydration, kidney problems, stomach ulcers, bleeding risks, or certain medications. Acetaminophen may be unsafe with liver disease, heavy alcohol use, or other products containing acetaminophen. Aspirin has additional bleeding and allergy considerations.

Don't give medication to someone who is confused, repeatedly vomiting, unable to swallow safely, or having a reduced level of consciousness. If the person needs a pain reliever repeatedly to keep moving, that is a reason to reconsider the plan, not a reason to increase the dose.

Know the signs that mean you need urgent help

Call the appropriate emergency service or activate your emergency communication plan immediately for a headache with any of the following:

• sudden, severe pain that peaks rapidly or feels unlike previous headaches;
• confusion, fainting, seizure, unusual drowsiness, or a change in behaviour;
• weakness, numbness, facial drooping, trouble speaking, or difficulty walking;
• new vision loss, severe eye pain, or major changes in coordination;
• repeated vomiting or an inability to keep fluids down;
• a high fever with a stiff neck, rash, or marked sensitivity to light;
• severe shortness of breath, chest pain, blue or grey lips, or a cough with frothy sputum;
• signs of serious heat illness, including worsening confusion, collapse, or inability to drink;
• a headache after a significant fall or blow to the head, particularly with vomiting, confusion, or increasing pain; or
• a headache that is worsening at altitude or accompanied by breathlessness at rest or loss of coordination.

These symptoms can have several causes, and a remote trail diagnosis isn't reliable. Keep the person supervised, protected from heat and cold, and as still and comfortable as practical while arranging help. Follow instructions from emergency dispatchers or rescue professionals. Don't leave someone seriously ill alone to fetch help unless there is no safer option.

When it is reasonable to continue—or turn around

A mild headache that clearly improves after rest, cooling, food, and appropriate fluids may not require evacuation. Even then, I would shorten the day, avoid a major ascent, and keep the group together. Tell someone at home or at the next checkpoint what happened if you have a way to communicate.

Turn around or move towards help when the headache is moderate to severe, keeps returning, is getting worse, or has no clear improvement after a reasonable rest period. Do the same if you are relying on repeated medication, can't eat or drink normally, or would need to travel through more heat, elevation, remoteness, or technical terrain.

A partner’s judgement is valuable here. Headaches can affect concentration and decision-making, so the person in pain shouldn't be the only one deciding whether the group continues.

Practical next steps

Once you are safely out, seek medical advice if the headache persists, keeps recurring, follows a head injury, or was associated with heat illness, altitude exposure, carbon monoxide exposure, or neurological symptoms. Write down the timing, elevation, weather, exertion, food and fluid intake, medication, and any other symptoms. That information can help a clinician assess what happened.

For future trips, carry more than pain medication: a way to communicate, a route plan with exit options, suitable sun and heat protection, and enough food and water for delays. Most importantly, make “stop and assess” an ordinary trail decision. A changed plan is inconvenient. Continuing into a problem is how a manageable headache can become a rescue.