The following factors are usually responsible for the loss of energy in summer: 1. The symptoms of weakness can also be caused by the loss of ions, such as hypokalemia and hyponatremia. 3, summer is easy to get wind-heat type cold, in the early stage of wind-heat type cold will also be due to weakness, resulting in weakness and other clinical manifestations. 4, summer because the blood vessels are over-open state, will lead to transient hypotension and hypoglycemia clinical symptoms, will also appear weakness, weakness clinical manifestations.