Stomach discomfort body no strength, consider and bad habits, gastrointestinal diseases,, neurosis and other causes. 1. Bad habits: Long-term poor dietary habits, overwork, mental stress, overeating, spicy and stimulating food intake, smoking and drinking, or taking certain medications may cause gastrointestinal symptoms, resulting in an upset stomach and lack of energy. 2. Gastrointestinal diseases: Gastrointestinal diseases, such as acute and chronic gastritis, peptic ulcer, gastroesophageal reflux, etc. may affect the function of the stomach, resulting in gastric discomfort, and some patients may also be accompanied by fatigue. 3. Neurosis: Neurosis is a generalization of a group of neurological disorders, which is related to factors such as heredity and brain damage. Patients may show emotional instability, reduced mental activity, and may also be accompanied by symptoms of stomach discomfort and lack of body fatigue. An upset stomach and lack of energy in the body are considered to be related to a variety of factors. If you suspect that it is caused by a digestive system disease, you can visit the gastroenterology department of the hospital to find the cause.