If you have headache, back pain and weakness, you should first rule out whether it is caused by a cold, whether you have a recent history of cold, and whether your body has a series of other cold symptoms such as fever, cough, runny nose and congestion. There are some cold patients who only show headache, back pain, weakness and no other series of cold symptoms. If the symptoms are caused by a cold, there is usually no big problem if the symptoms are treated according to the symptoms of the cold. Internal diseases can also cause headache, back pain, weakness, such as kidney nephritis, or rheumatic immune system diseases can also cause such symptoms, and need to go to a specialized hospital to perform further blood tests, ultrasound and other tests to make a clear diagnosis.