Climbing areas at a high altitude causes problems like nausea, vomiting, headache and tiredness. You can feel dizzy in higher altitudes. Some people have breathing difficulty with shortness of breath. Fluid is deposited in lungs. The pulse becomes very fast. All these problems are symptoms of a condition known as altitude sickness. The problem is very common in people who travel or do hiking in mountains. It causes difficulty in walking. Some people even lose consciousness. If you are travelling to higher altitudes, you should take steps to prevent these problems. You should climb the mountains very slowly. Following are some useful tips on how to prevent altitude sickness.