Standing for a long time knee pain, may be due to muscle damage, arthritis and meniscus injury and other reasons. 1. Muscle injury: After standing for a long time, muscle strain may cause muscle injury, which in turn leads to knee pain symptoms. At this time, you should pay attention to rest and avoid standing for a long time, so as to slow down the damage. 2. Arthritis: If the patient suffers from arthritis, the lesion may occur, long time standing, it will lead to the emergence of joint pain symptoms. At this time should go to the hospital in time for treatment, you can take non-steroidal anti-inflammatory drugs such as ibuprofen under the guidance of the doctor, so as to reduce inflammation and pain. 3. Meniscus injury: If the patient has symptoms of meniscus injury, standing for a long time may lead to aggravation of the injury and thus show symptoms of pain, should go to the hospital in time for treatment. Standing for a long time knee pain, may also be due to ligament damage and other reasons, the patient should go to the hospital in time for examination, and then relevant treatment.