There are many reasons for body weakness. Physiological factors such as lack of sleep, excessive exercise, and physical weakness, and pathological factors such as colds, anemia, thyroid disease, and diabetes can occur. 1. Physiological factors: If there is insufficient sleep or low quality of sleep, the body and brain do not get enough rest and conditioning, and weakness may occur. In addition, if the body is weak due to excessive exercise and lack of nutrition, it will also be easy to feel fatigue, and the body will become weak and feeble. 2. Disease factors: the most common cause of weakness is cold and flu, when the body’s resistance decreases, accompanied by a sense of fatigue. Systemic diseases may also cause weakness, such as anemia, hypothyroidism or hyperthyroidism, diabetes and other diseases, you need to pay attention to whether it is accompanied by emaciation, such as weight loss in a short period of time. It may also occur in diseases of the nervous and muscular system, such as neuritis, acute or chronic muscular lesions such as rhabdomyolysis. As you can see, there are many kinds of diseases with body weakness and weakness, and patients should seek medical treatment in time to clarify the cause of the disease and follow the doctor’s instructions.