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Table 1 Diagnostic criteria for acute mountain sickness in China.

From: Population level determinants of acute mountain sickness among young men: a retrospective study

Symptoms Degree Score
Headache   
1. No noticeable headache, no suffering expression, no effect on daily activity. ± 1
2. Mild headache with suffering expression, obvious improvement of headache after taking regular analgesic medicine, no effect on daily activity. + 2
3. Moderate headache with suffering expression, slight improvement of headache after taking regular analgesic medicine, daily activity is affected. ++ 4
4. Severe and unbearable headache, lies in bed and can not get up, no effect from regular analgesic medication. +++ 7
Vomiting   
1. Vomiting 1 to 2 times a day, vomit contains only intake food, obvious improvement with regular anti-emetic medication, no effect on daily activity. + 2
2. Vomiting 3 to 4 times a day, final vomit contains gastric juice, slight improvement with anti-emetic medication, daily activity is affected. ++ 4
3. Vomiting more than 5 times a day, must lie in bed and cannot get up, no improvement with regular anti-emetic medication. +++ 7
Other   
Dizziness/light-headedness, nausea, palpitation, shortness of breath, chest distress, dazzling/blurred vision, sleeplessness (insomnia), anorexia, abdominal distension, diarrhea, constipation, cyanosis of the lips, lethargy, and numbness of the extremities   1 point each
  1. * a person with headache+, or vomiting+; or total score of 5 points or more was diagnosed AMS.