What is the reason for shortness of breath, lack of energy, and easy fatigue?

Shortness of breath, weakness, lack of spirit, fatigue may be caused by insufficient sleep, mainly related to poor sleep quality, often staying up late and other factors, long-term lack of sleep will lead to insufficient rest of the brain of the body, resulting in listlessness and fatigue. Secondly, it may also be caused by mental diseases, such as depression, depression patients will appear powerless, general fatigue and other symptoms. The patient's discomfort symptoms may also be caused by malnutrition, malnutrition will lead to physical deterioration, and the body intake of energy can not support life activities, will produce fatigue.