Dr Malik says:
Forget the risk of falls, snow and ice.
Oxygen levels are lower at altitude – no good if you have heart or lung disease.
In addition, even healthy people can be prone to mountain sickness. The most serious types can lead to brain swelling (High Altitude Cerebral Odema – HACO) or lung swelling (High Altitude Pulmonary Odema- HAPO). Watch out for headaches or breathlessness!