Nocturnal soreness in the knee joint is a more specific case of knee pain. It is recommended to consult a specialist as early as possible for the following main reasons: 1. related to blood flow: it is a common cause of nocturnal soreness in the knee joint. Local blood flow slows down when the patient sleeps at night, leading to chronic inflammatory stimulation and causing pain; 2. caused by tumor factors: for example, osteoblastoma, etc., which is common in nocturnal pain, should be promptly consulted for routine examination to exclude the possibility of malignant disease; 3. lack of exercise or even weakening of physical fitness in the short term.