Weakness is a non-specific clinical symptom in clinical practice, and weakness may be a common clinical symptom of many diseases. The details are as follows: 1. Infectious diseases: if patients have symptoms of low fever, or fever, patients tend to feel more tired and weak; 2. Cardiovascular system diseases, respiratory system diseases: if patients’ cardiopulmonary function is affected, they may also feel weak or weak; 3. Digestive system diseases: if liver function is impaired, weakness or weakness may also occur, often accompanied by some Digestive system specific symptoms, such as poor appetite, nausea, vomiting, eructation, diarrhea, constipation, etc.; 4, metabolic and endocrine system diseases: such as hypothyroidism, etc., can cause malaise symptoms. In a word, there are more diseases that cause weakness or generalized weakness, and they are distributed in different systems and disciplines. Weakness symptoms are very common in clinical practice, and the same phrase is used to describe malaise, of which the etiology varies.