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Signs of altitude sickness: what should I look for?

April 5, 2026

Quick Answer

Look for headaches, nausea, fatigue, and shortness of breath, which are primary symptoms of altitude sickness. These symptoms can appear within 6 to 24 hours of ascending to high altitudes. Monitor your body's response closely and seek medical attention if symptoms worsen.

Recognizing the Signs of Altitude Sickness

Altitude sickness can be a life-threatening condition if left untreated. It occurs when the body cannot adapt to high altitudes, causing a lack of oxygen in the bloodstream. Monitor your body’s response closely for the following symptoms:

  • Headaches: Mild to severe headaches can be a sign of altitude sickness. If the headache persists or worsens, seek medical attention.

  • Nausea and Vomiting: These symptoms can be a sign of altitude sickness, especially if accompanied by other symptoms such as dizziness or fatigue.

  • Fatigue: Feeling extremely tired or weak can be a sign of altitude sickness. If you are experiencing fatigue and other symptoms, seek medical attention.

  • Shortness of Breath: Difficulty breathing or feeling winded even when sitting still can be a sign of altitude sickness. This symptom can worsen at night, making it difficult to sleep.

Altitude Sickness Stages

Altitude sickness can be divided into three stages: Acute Mountain Sickness (AMS), High Altitude Pulmonary Edema (HAPE), and High Altitude Cerebral Edema (HACE).

  • Acute Mountain Sickness (AMS): This is the most common form of altitude sickness, characterized by headaches, nausea, and fatigue. If left untreated, AMS can progress to HAPE or HACE.

  • High Altitude Pulmonary Edema (HAPE): This is a life-threatening condition characterized by fluid buildup in the lungs. Symptoms include shortness of breath, coughing, and fatigue.

  • High Altitude Cerebral Edema (HACE): This is a life-threatening condition characterized by fluid buildup in the brain. Symptoms include severe headaches, confusion, and loss of coordination.

Prevention and Treatment

Preventing altitude sickness is key. To minimize the risk of developing altitude sickness:

  • Ascend gradually: Climb to higher altitudes gradually, allowing your body to adapt.

  • Stay hydrated: Drink plenty of water and avoid dehydration.

  • Monitor your body’s response: Pay attention to your body’s response to high altitudes and seek medical attention if symptoms worsen.

  • Descend if necessary: If symptoms persist or worsen, descend to a lower altitude and seek medical attention.

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