Soreness and weakness of the knee is a clinical symptom with many causes, both physiological and due to many diseases, and needs to be analyzed in conjunction with the specific situation. If you are overworked, winded, or cold, you may experience weakness in the knee, which may improve after a period of rest. If the knee is weak and sore for a long time, and it is not relieved even after resting, it is necessary to consider the possibility of disease. It is recommended to go to the neurology, orthopedics, rheumatology and other departments of the hospital, and the doctor will conduct relevant examinations according to your symptoms and signs to make a clear diagnosis and treat accordingly.