A sore and weak body may be caused by physiological factors such as strenuous exercise and overwork, or by diseases such as anemia and hypokalemia. 1. Physiological factors: strenuous exercise, overwork, and lack of sleep may cause aches and pains. If the patient is not accompanied by other uncomfortable symptoms, it is a normal phenomenon, no need to worry. 2. Anemia: Anemia may be caused by insufficient or reduced production of red blood cells, excessive destruction of red blood cells, blood loss and other factors. Patients will have symptoms such as muscle weakness, easy fatigue, poor concentration, etc., which will be manifested as soreness, weakness and lack of energy. 3. Hypokalemia: Hypokalemia may be caused by factors such as low potassium intake, increased potassium entering the cells, and loss of urine. Patients mainly manifest muscle weakness, fatigue, cardiac arrhythmia, etc., and the patients will have soreness, weakness and lack of energy. Once the patient is in the situation of aches, pains, weakness and lack of energy, he should go to the regular hospital to find out the cause of the disease. Once diagnosed, the patient should actively cooperate with the doctor to take relevant treatment measures.