Sitting down and getting up again with back pain may be lumbar muscle strain, lumbar disc herniation, lumbar spinal stenosis, bone fracture and other factors. 1. Lumbar muscle strain: Continuous standing and excessive weight bearing on the waist may cause lumbar muscle strain, leading to lumbar pain and other symptoms, which may be aggravated by activities. 2. Lumbar disc herniation: Lumbar disc herniation can cause lumbar pain symptoms, sitting down and then get up with a bending motion, can aggravate the symptoms of lumbar pain. 3. Lumbar spinal stenosis: patients with lumbar spinal stenosis often have lumbar pain, lower limb pain, intermittent claudication and other symptoms, and the symptoms of lumbar pain are aggravated when standing or walking. 4. Fractures: Spinal fractures can also lead to low back pain. Osteoporosis and a history of low back injuries may lead to spinal fractures. Sit down and get up again back pain may also have other causes, such as lumbar myofasciitis, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.