Altitude sickness is primarily caused by the gradual decrease in oxygen that the body receives as it climbs to higher altitudes. This can have a number of effects on the body, including fatigue, muscle weakness, nausea and even loss of consciousness in severe cases. Lemon soda is known to be an effective remedy for altitude sickness, as it can prevent vomiting, which is one of the first and most common symptoms of this condition. This can help prevent further dehydration, which is another common symptoms that is very difficult to overcome.