If travelling anything above 2,500 metres (i.e. when going hiking), most people will experience symptoms of altitude sickness such as breathlessness, difficulty sleeping and a dry cough and usually disappear when the body has got used to the reduction in oxygen.

Acute Mountain Sickness (AMS) is a more serious condition and occurs when reaching an altitude of above 3,000 metres. Symptoms include headache, nausea, dizziness and loss of appetite. As part of building a first aid kit, advise your customers to include paracetamol and ibuprofen to help relieve headaches.

To read further on altitude sickness, vist the NHS UK website