Sitting with a weak back may be caused by back muscle weakness, ankylosing spondylitis, spinal deformity, etc., which can be treated by using drugs such as celecoxib or surgery. 1. Dorsal muscle weakness: lack of exercise for the low back muscles, or long-term muscle tension, fatigue and other factors cause fasciitis, can cause dorsal muscle weakness, resulting in sitting back straight or pain. It can be treated with anti-inflammatory and pain-relieving medicines such as Celecoxib and other medicines through lumbar and back muscle exercise. 2. Ankylosing spondylitis: hereditary or infectious factors can induce ankylosing spondylitis, which can cause pain in the lower back, stiffness after standing still, and other symptoms, and can lead to the back not being straight. Symptoms can be alleviated by drugs such as celecoxib, and patients with severe spinal deformity can be treated by surgery. 3. Spinal deformity: Poor posture habits, such as sitting and standing, can cause spinal deformity and lead to poor back straightening. It can be restored through surgical restoration, functional exercise or immobilization with a brace. Sitting back is not straight patients need to go to the hospital for relevant examination in order to clarify the cause of the disease and the appropriate treatment to alleviate the symptoms, if necessary, please use drugs under the guidance of a physician.