The following general and specific health problems may be faced during trekking at high attitude;

General
1.  Headache, Cold, Flue    
2.  Tiredness    
3.  Stomach Problems-Diarrhoea/Constipation    
4.  Nausea, Vomiting    
5.  Hurt-burn    
6.  Boils    
7.  Injuries    

Specific
1.   Frost Bite: this disease is normally caught at high attitude and low temperature. It affects the parts of body not close to heart i.e. fingers etc. Having the affected parts turned bluish or yellowish and numb are some of its symptoms. The affected body parts must be washed repeatedly with water up to 40C hot and immediate arrangement should be made to bring the patient to lower altitude.
2.   Altitude Sickness: The amount of oxygen at higher altitude gets thinner and lungs have to work harder to suck oxygen in. This results in headache, gasping and higher body temperature. The patients should be immediately brought to lower altitude and medicated with Asprin or Paracetamol.
3.   Snow Blindness: Trekkers/ Mountaineers venturing in the snow can be hit by snow-blindness. The disease is caused by looking at snow while walking in it for long time. The use of goggles is highly recommended during such expeditions.
4.   Dehydration: Head and lifting heavy luggage may cause dehydration. A minimum of 4 Liters of water/soft drinks must be consumed per day. In case of dehydration ORS is the recommended treatment.
Acute Mountain Sickness (AMS): Acute Mountain Sickness is experienced move frequently in mountaineering than trekking. Those with respiratory problems should start taking Tab. Diamox (after consulting the doctor).

AMS has two forms
1.   Cerebral Odema: In case of Cerebral Odema extra liquid gets stored in the head which can be fatal if the patient is not brought to lower altitude.
2.   Pulmonary Odema: In the case fluid is store in lungs. Such patients too should be brought to lower altitude and a doctor should be immediately consulted.