Clinically, many people will have no energy and lack of energy, many elderly people because of chronic cerebral insufficiency of blood supply, cerebral arteriosclerosis and other diseases, resulting in the daytime will be manifested in the lack of energy, lack of energy symptoms. There are also some elderly people who suffer from cardiac diseases, resulting in a decrease in cardiac output, and the patient will also experience dizziness, lack of energy and fatigue. Some young people who stay up late, do not sleep well or do not sleep through the night may also show symptoms of lack of energy and fatigue during the day. Some people also have electrolyte disorders due to nausea, vomiting, gastrointestinal colds, diarrhea, etc. Hypokalemia may also cause symptoms of weakness and fatigue.