Sitting pubic bone pain is usually caused by pregnancy, inflammatory diseases, pubic bone fracture and so on. 1. Pregnancy: In late pregnancy, with the gradual increase of the fetus, excessive pressure will be exerted on the pelvic pubic symphysis, resulting in separation of the pubic bone, thus causing pubic bone pain. 2. Inflammatory diseases: If there is aseptic inflammation at the pubic bone, there can be pain in the pubic bone while sitting, such as pubic fasciitis, which is mainly manifested as pain in and around the pubic bone. 3. Fracture of the pubic bone: if the elderly patients have pain in the pubic bone while sitting, it may be caused by fracture of the pubic bone. Because the elderly are prone to osteoporosis, only a slight bump can cause a fracture of the pubic bone, after the fracture of the pubic bone, the patient will take the sitting position will be squeezed to the injury site, so sitting on the pubic bone will hurt. There are many reasons for pubic bone pain, should go to the hospital as soon as possible, clear the cause of the disease for standardized treatment, so as not to cause adverse consequences.