How to Treat Altitude Sickness Safely While Traveling

A headache that starts the evening after arriving in Bogota or beginning a mountain trek can be easy to dismiss as jet lag, dehydration, or a long travel day. But when it comes with nausea, dizziness, unusual fatigue, or poor sleep, altitude may be the reason. Knowing how to treat altitude sickness means recognizing when rest is enough and when your body is telling you to descend and get medical help.

Altitude illness can affect otherwise healthy, active travelers. Fitness does not protect you, and symptoms can progress if you keep climbing or push through a demanding itinerary.

What altitude sickness feels like

The most common form is acute mountain sickness, often called AMS. It usually begins six to 24 hours after a rapid ascent to higher elevation, although timing varies. A persistent headache is the hallmark symptom, especially when paired with nausea, loss of appetite, fatigue, lightheadedness, or difficulty sleeping.

Altitude sickness happens because the air contains less available oxygen at elevation. Your body needs time to acclimatize. The faster you ascend, the higher you sleep, and the more exertion you do early on, the more likely symptoms become.

For travelers in Colombia, context matters. Medellin sits at about 4,900 feet, where classic altitude illness is less common for most visitors. Symptoms are more likely after arriving in higher places such as Bogota, traveling to mountain destinations, or sleeping at a significantly higher elevation than usual. Still, do not assume every headache at altitude is harmless. Dehydration, migraine, viral illness, alcohol, medication effects, and other conditions can look similar.

How to treat altitude sickness when symptoms are mild

If your symptoms are mild, the first treatment is simple: stop ascending. Do not continue to a higher sleeping altitude until you feel clearly better. Rest, reduce physical activity, eat light meals if you can tolerate them, and drink fluids normally.

Hydration can help if you are dehydrated, but drinking excessive amounts of water will not cure altitude sickness and can be unsafe. Aim for pale-yellow urine rather than forcing liters of water. Avoid alcohol, sleeping pills, and sedating medications, which can worsen breathing and make it harder to notice a decline.

For a mild headache, a standard over-the-counter pain reliever may offer comfort if it is safe for you to take. It treats the symptom, not the cause. If the headache worsens despite rest, or it comes with concerning neurological or breathing symptoms, do not keep self-treating.

Oxygen can improve symptoms quickly when it is available, but it should not be used as permission to continue ascending. The goal is to stabilize you while you rest, arrange an evaluation, or descend if needed.

The most effective step is often descent

If symptoms do not improve after rest, if they become more than mild, or if you are unsure what is happening, descend at least 1,000 feet, or about 300 meters, if it is safe to do so. More descent may be needed depending on the severity of symptoms and the terrain.

Descending is not overreacting. It is the definitive treatment for worsening altitude illness. Even a relatively small drop in sleeping elevation can make a meaningful difference. If weather, darkness, transport limitations, or your condition make descent difficult, seek urgent medical guidance immediately.

When altitude sickness is an emergency

Severe altitude illness can involve the lungs or brain. These conditions are uncommon, but they can become life-threatening quickly and require immediate emergency care, oxygen, and descent. Do not wait until morning, attempt to hike out alone, or rely on a wellness treatment to manage these symptoms.

Seek emergency help right away for any of the following:

• Shortness of breath while resting, chest tightness, a persistent cough, or pink or frothy mucus

• Confusion, unusual behavior, severe drowsiness, fainting, or difficulty staying awake

• Trouble walking in a straight line, poor coordination, weakness, or slurred speech

• A severe headache that is escalating, especially with repeated vomiting or vision changes

Fluid in the lungs at altitude is called high-altitude pulmonary edema, or HAPE. Swelling in the brain is called high-altitude cerebral edema, or HACE. Both need urgent medical treatment. A person with these symptoms should not drive themselves, be left alone, or continue their itinerary.

Can medication help?

Certain medications can be appropriate, but they should be used with clinical guidance. Acetazolamide is commonly prescribed to help prevent altitude sickness and can also support acclimatization in some situations. It is not right for everyone, particularly people with certain allergies, kidney problems, pregnancy considerations, or medication interactions.

Dexamethasone may be used in specific cases of severe altitude illness or when descent is delayed. It can be highly effective, but it is not a substitute for getting to a lower elevation. Symptoms can return when the medication is stopped if the underlying altitude exposure continues.

A clinician can help determine whether your symptoms fit altitude illness, whether medication is appropriate, and whether you need oxygen, monitoring, or in-person evaluation. This is especially valuable if you have heart or lung disease, sleep apnea, are pregnant, take regular prescription medications, or have had altitude illness before.

What not to do when you feel unwell at elevation

The biggest mistake is continuing upward because you have reservations, a group itinerary, or a summit goal. Altitude illness does not respond to willpower. A guide's schedule, a nonrefundable hotel, or the feeling that you are slowing others down should never outweigh worsening symptoms.

Avoid intense exercise while symptoms are present. Do not use alcohol to help you sleep, and do not assume an IV, energy drink, or extra water will resolve a potentially serious problem. These measures may address dehydration or comfort, but they do not replace acclimatization, oxygen when needed, descent, or medical assessment.

It is also wise not to take a new medication borrowed from another traveler. The right treatment depends on your symptoms, health history, current medicines, and how quickly you can descend.

Prevent altitude sickness before your next ascent

A gradual itinerary gives your body the best chance to adjust. If possible, spend a night or two at an intermediate elevation before going higher, particularly before sleeping above 8,000 feet. Keep the first day easy: skip strenuous workouts, limit alcohol, eat regular meals, and prioritize sleep.

If you know you will ascend rapidly or have experienced altitude sickness in the past, arrange a medical consultation before your trip. Preventive medication may be considered, but it works best as part of a thoughtful ascent plan rather than as a way to ignore symptoms.

Travelers who become ill at altitude often need one thing most: clear, calm decision-making. If you are in Medellin, Poblado, Envigado, or Laureles and have symptoms after high-altitude travel, Equilibrium Urgent Care can help you discuss your symptoms in English and determine the safest next step. For emergency warning signs, seek emergency care without delay.

Your trip can wait. Breathing comfortably, thinking clearly, and getting safely to a lower elevation cannot.