Altitude sickness (known as soroche to the locals) is a physical reaction to lower amounts of oxygen found at high altitudes. It is very common for travellers to experience altitude sickness while in Peru.
The symptoms can include headache, dizziness, fatigue, nausea, shortness of breath, loss of appetite, and/or vomiting.
It is impossible to predict who will be affected by altitude, as it has little to do with fitness or health. Everybody reacts differently to altitude and some people are more susceptible than others, but most have fewer issues as long as they take time to acclimatize properly.
Below is a list of basic guidelines that Apu Andino recommends you follow to better acclimatize to high altitude:
Major cities and locations with corresponding altitude: