There are more reasons for exercise back pain, it may be physiological back pain caused by excessive exercise, or it may be caused by lumbar muscle strain, lumbar spondylosis, ankylosing spondylitis, osteoporosis and other pathological reasons. 1. Excessive exercise: excessive lumbar activities or overwork, causing lactic acid accumulation within the lumbar muscles, causing physiological lumbar pain, which can be relieved after rest. 2. Lumbar muscle strain: after strenuous exercise, it may lead to lumbar muscle strain, causing pain in the lower back. 3. Lumbar spine lesions: the more common ones are lumbar disc herniation, lumbar spinal stenosis, lumbar degenerative changes, etc., which can lead to aggravation of the symptoms and lumbar pain when exercising. When there is compression of the spinal cord and nerve roots, it is often accompanied by numbness and pain in the lower limbs. 4. Ankylosing spondylitis: it is a chronic disease of the spine, which can cause pain in the lower back and aggravate the symptoms of lower back pain when exercising. 5. Osteoporosis: mostly seen in the elderly, caused by bone metabolism disorders, can appear in the lower back pain, aggravated after exercise, may also appear in the lumbar vertebrae compression fracture, resulting in back pain. There are other causes of exercise back pain, such as urinary tract diseases, trauma, etc., if the rest does not relieve, it is recommended to go to the hospital in a timely manner to improve the auxiliary examination, in order to clarify the cause of the disease, and then by a professional physician targeted treatment, so as not to delay the condition.