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Mountain Fever – With symptoms such as intestinal discomfort, diarrhea, headache, skin rashes, respiratory distress, and fever, this ailment was usually not fatal. The diseases that fit these symptoms include Rocky Mountain spotted fever, typhus, typhoid fever, and scarlet fever.
- Overview
- Symptoms and Causes
- Diagnosis and Tests
- Management and Treatment
- Prevention
- Outlook / Prognosis
- Living With
- Additional Common Questions
Altitude sickness is when your body doesn’t have time to adjust to lower oxygen availability higher up in the atmosphere. It’s usually preventable and treatable. When severe, it can rapidly turn into a life-threatening concern. Recognizing the symptoms early is key to pausing your ascent, which can head off complications or worsening symptoms.
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OverviewSymptoms and CausesDiagnosis and TestsManagement and TreatmentPreventionOutlook / PrognosisLiving WithAdditional Common Questions
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What are the symptoms of altitude sickness?
Altitude sickness can cause many symptoms, and these can vary depending on the severity. The symptoms of acute mountain sickness usually appear within the first day or so of reaching a high altitude. More severe forms like HAPE or HACE take longer to appear, usually between two and five days. The symptoms of AMS include: Headache (this is the most common symptom). Nausea and vomiting. Loss of appetite. Fatigue, even when resting. Malaise (a noticeable “unwell” feeling). Trouble sleeping. Dizziness or lightheadedness. Vision changes (while rare, these usually indicate more severe altitude sickness, and are due to blood vessel ruptures in your retinas).
What causes altitude sickness?
Given time, your body can usually adapt to altitude-related changes that affect how much oxygen you get with each breath. Without enough time to adapt, altitude sickness is the result.
What are the complications of altitude sickness?
Altitude sickness can become deadly if AMS turns into HAPE or HACE. HAPE can be deadly within 12 hours. HACE can be deadly within 24 hours. That’s why recognizing altitude sickness of any kind is critical to preventing severe complications.
How is altitude sickness diagnosed?
A healthcare provider can diagnose altitude sickness based on your symptoms and a physical exam. That includes checking your breathing, blood pressure and heart rate. They’ll also ask questions about what you’re experiencing and how you feel. They may also check your coordination or other abilities to see if you have any signs of a more serious condition like HAPE or HACE.
How is altitude sickness treated, and is there a cure?
There’s only one way to “cure” altitude sickness outright: descend to a lower altitude. Several treatments can help altitude sickness when it’s not as severe. Some of these are also helpful when an immediate descent isn’t possible. Treatment approaches include: Stop and acclimate. Stopping and resting is a good idea at the first signs of altitude sickness. Descend. If symptoms are more severe (such as additional dizziness, fatigue or nausea) or get worse, descending is a top priority. Most experts recommend descending until the symptoms get better. This usually involves a decrease of at least 984 feet (300 meters) and as much as 3,281 feet (1,000 meters). Supplemental oxygen. Breathing higher concentrations of oxygen can help offset some of the symptoms of altitude sickness. Medications. Certain medications, especially acetazolamide, dexamethasone or nifedipine, can treat altitude sickness and delay more severe symptoms or complications. Dexamethasone and nifedipine are generally reserved for moderate or worse altitude sickness. Hyperbaric therapy. This is similar to treating a scuba diver with decompression sickness (better known as “the bends”). At high altitudes, hyperbaric therapy is possible with portable hyperbaric bags (sometimes known as “Gamow bags” after their inventor, Igor Gamow). These can delay the worsening of symptoms until it’s possible to evacuate a person to a lower altitude.
How soon after treatment will I feel better?
How quickly you feel better depends strongly on the severity of your altitude sickness and the treatments you receive. Descending to a lower altitude is the fastest way to feel better, and most people feel progressively better as they descend. People who choose to stop and acclimate may have symptoms that last several hours or up to a day. Minor symptoms usually stop within a day or two as your body gets used to the altitude. Care at Cleveland Clinic Find a Primary Care Provider Schedule an Appointment
Can altitude sickness be prevented?
Altitude sickness is very preventable, and there are a few key ways you can prevent it. They are: Limit how fast you ascend. Altitude sickness is more likely when you ascend too far and too fast. A slower ascent is ideal for preventing altitude sickness. At 8,202 feet (2,500 meters), the recommendation is ascending no more than 984 feet (300 meters) to 1,640 feet (500 meters) per day. The starting altitude for the day is where you last slept. And if you ascend quickly early on because you flew to a high-altitude destination, factor that into your plans! Take rest days to acclimate. At 8,202 feet (2,500 meters), experts recommend a day of initial rest to acclimate. If you continue ascending, rest every third day. Above 14,000 feet (4,267 meters), a two-day rest per 1,000 feet is recommended. Sleep at a lower altitude if possible. If you can, ascend during the day and return to a lower altitude to sleep. That can make altitude sickness less severe and make it easier to acclimate. Preventive medications. Medications like acetazolamide or nifedipine can prevent altitude sickness and treat it. Phosphodiesterase (PDE) inhibitors like sildenafil and tadalafil can also serve as preventive medications.
What can I expect if I have altitude sickness?
For most people, altitude sickness doesn’t get beyond acute mountain sickness, the mildest form. A headache is the most common — and often the earliest — symptom of acute mountain sickness. If you notice you have a headache or other mild symptoms and stop ascending, your symptoms should remain the same. After a day or two, they should stop.
What’s the outlook for altitude sickness?
The outlook for altitude sickness depends on the severity, how you react to the symptoms and how you respond to treatment. If you ignore symptoms and keep ascending, you’ll likely experience worsening symptoms. Ascend too quickly, and you’re more likely to develop dangerous complications. If you experience more disruptive symptoms of acute mountain sickness, especially nausea or fatigue, you should stop ascending. They’re a warning that you’re at risk for more problems if you keep going. If you experience symptoms of HAPE or HACE, especially trouble breathing or loss of coordination, descend immediately (if possible). They’re signs of life-threatening complications.
How do I take care of myself?
If you develop symptoms of altitude sickness, the best thing you can do right away is not make it worse. Stop ascending, or descend if you can. Resting and limiting exertion are also helpful. Try to make it as easy as possible for your body to adjust to the altitude. If you use tobacco products, you should quit before going to high altitudes. Tobacco use of any kind can affect oxygen levels, which is a key concern with altitude sickness. If you use tobacco products, stop. Your healthcare provider can guide you and offer resources on how to do so before you travel.
When should I see my healthcare provider, or when should I seek care?
You should talk to a healthcare provider before traveling to a high-altitude destination. They can advise you on precautions to take that’ll be helpful for your specific needs. They may also be able to advise you on preventive measures or prescribe medications that can prevent altitude sickness.
How serious is altitude sickness?
The milder form of altitude sickness, acute mountain sickness, isn’t dangerous (as long as you don’t keep ascending). It’s unpleasant and disruptive but should resolve in a day or two. The more severe forms of altitude sickness, HAPE and HACE, are life-threatening medical emergencies. They need immediate care. A note from Cleveland Clinic Altitude sickness is a widespread issue for people traveling to higher elevations. If you experience the symptoms, take them for the warning signs they are. Stop ascending and descend if you can. Resting and giving your body time to acclimate are the best ways to get past altitude sickness. Treatments can also help you feel better. Altitude sickness is often very preventable. A flexible schedule can make a big difference, allowing time to acclimate to higher altitudes. Medications can also help. And if you experience more severe symptoms, don’t ignore them. Medically Reviewed Last reviewed by a Cleveland Clinic medical professional on 08/21/2023. Learn more about our editorial process.
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Apr 26, 2022 · Rocky Mountain spotted fever (RMSF) is a bacterial infection that you can get after a tick bite. Most people get this infection in spring and summer, warm months when ticks...
Oct 30, 2021 · 5 min read. Sometimes called “mountain sickness,” altitude sickness is a group of symptoms that can strike if you walk or climb to a higher elevation, or altitude, too quickly. What Causes...
Jan 3, 2022 · Acute mountain sickness is the least dangerous of several kinds of altitude illnesses that can occur. This sickness affects close to half of all people who begin near to sea level and climb to 14,000 feet of elevation without scheduling enough rest time.
- hhp_info@health.harvard.edu
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The meaning of MOUNTAIN FEVER is any of various febrile diseases occurring in mountainous regions. any of various febrile diseases occurring in mountainous regions; equine infectious anemia… See the full definition
