Knee pain at night is commonly seen in the following situations: 1, seen in the rapid growth and development period of adolescents, due to the rapid growth and development of bones, resulting in the development of soft tissues around the bones and joints can not keep up with the development of bone speed, so that the growth pain, this pain to the night pain is the main, and can be relieved very quickly after resting, there is no other symptom, and will continue to be intermittent! 2.It is also seen in adolescents’ knee pain caused by tumor, because the knee joint is a good area for tumors, and night pain is also a characteristic of tumor pain.3.It is seen in the old people’s osteoarthritis of the knee joint due to degeneration, hyperplasia, and long-term injuries, and osteoarthritis can also cause pain at night because of the cold or bad sleeping posture and so on.