The common causes of table tennis back pain are sports injury, lumbar back fasciitis, lumbar muscle strain and so on. 1. Sports injuries: If you exercise too much, a large accumulation of lactic acid in the muscles of the lower back or improper posture when exercising, lumbar sprain, resulting in back muscle injury, the injured muscles are pulled when exercising, all of which can cause pain. 2. Lumbar back myofasciitis: chronic strain of the muscles and fascia of the lumbar back due to long-term poor posture, stooping, trauma, cold and other reasons, causing aseptic inflammatory reaction. Common symptoms include pain in the lower back, pain that worsens when the weather gets cold, and difficulty in bending over. 3. Lumbar muscle strain: If long-term bending work, weight bearing, poor posture, etc., resulting in chronic injury to the muscles and fascia of the lumbar back, causing aseptic inflammatory reaction, there can be pain in the lower back. The causes of table tennis back pain are more, may also be related to lumbar disc herniation, kidney stones, tumors and other diseases, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, targeted treatment.