1.Pain The most common symptom of primary osteoporosis is low back pain, which accounts for 70%-80% of the patients with pain. The pain spreads along the spine to both sides, decreases when lying on the back or sitting, increases when posterior extension or prolonged standing or sitting, is light during the day, increases at night and early morning when waking up, and increases when bending, muscle movement, coughing and bowel movement. 2. Shortening of body length and hunchback Most of them appear after pain. The anterior part of the vertebrae of the spine is almost mostly composed of cancellous bone, and this part is the pillar of the body, which is heavy and easily compressed and deformed, causing the spine to tilt forward and the dorsal curvature to increase, resulting in hunchback. 3, fracture This is the most common and most serious complication of degenerative osteoporosis.