Climbing stairs with lumbar muscle strain, lumbar intervertebral disc herniation, acute injury and so on. 1. Lumbar muscle strain: long-term engagement in heavy physical labor will occur lumbar muscle strain, climbing stairs can make the lumbar muscles are pulled, will induce lumbar distension or pain symptoms. 2. Lumbar disc herniation: when suffering from lumbar disc herniation, climbing stairs can cause disc herniation to aggravate, thus compressing the peripheral nerve roots to cause lumbar pain and lower limb pain. 3. Acute injury: Climbing stairs with improper posture or too strenuous can cause acute injury to the lumbar region, resulting in lumbar muscle spasms, local hemorrhage and edema, thus causing pain. Climbing stairs back pain may also be related to other causes, such as lumbar myofasciitis, etc., it is recommended to consult a doctor in a timely manner to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.