If the patient has a history of catching cold and suddenly has no energy, it is considered to be caused by cold or fever. If the patient has a history of diabetes, when the patient suddenly appears to have low blood sugar, he may also show symptoms such as sudden weakness, hand trembling, panic, and serious hunger, etc., which can be clearly measured by blood sugar. Sudden lack of strength, also consider cerebral blood supply deficiency, transient cerebral ischemic attack caused by the patient should have previous risk factors of cerebrovascular disease, there may be cerebral arteriosclerosis. Sudden loss of strength may also be caused by lower blood pressure, because low blood pressure can also lead to a state similar to deficiency, manifesting as dizziness and lack of strength.