Osteoporosis is a common clinical condition, and osteoporosis is what happens. Common osteoporosis has the following symptoms: 1. Pain. The most common symptom of primary osteoporosis is low back pain, which accounts for 70%-80% of the patients with pain. Pain spreads along the crest 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. Bone pain generally occurs when 12% or more of bone mass is lost. In old age osteoporosis, the vertebral trabeculae atrophy and decrease in number, the vertebral body compresses and deforms, the crest flexes forward, the lumbar muscles double contraction in order to correct the crest flexion, muscle fatigue or even spasm, producing pain. A recent compression fracture of the thoracolumbar spine can also produce acute pain, and the corresponding part of the crestal spine can have strong pressure pain and percussion pain, which can generally be gradually reduced after 2-3 weeks, and some patients can have chronic low back pain. If the corresponding crestal nerve is compressed, radiating pain of the extremities, sensory-motor disorders of both lower extremities, intercostal neuralgia, retrosternal pain similar to angina pectoris, or epigastric pain similar to acute abdomen may occur. If compression of the cremaster and cauda equina also affects bladder and rectal function. 2. Shortening of body length and hunchback. Mostly appear after the pain. The anterior part of the crestal vertebrae is almost mostly composed of cancellous bone, and this part is the pillar of the body with a large weight, especially the 11th and 12th thoracic vertebrae and the 3rd lumbar vertebrae, which have a greater load and are easily compressed and deformed, causing the crestal vertebrae to tilt forward and the dorsal curvature to increase, resulting in hunchback, and as we grow older, the osteoporosis increases and the hunchback curvature increases, resulting in significant knee contracture. Each person has 24 vertebrae, the height of each vertebra is about 2cm, when the elderly osteoporosis vertebral compression, each vertebrae shortened by about 2mm, the average length of 3-6cm shortened. 3, fracture. This is the most common and most serious complication of degenerative osteoporosis. 4.Decreased whistling function. Compression fractures of the thoracic and lumbar vertebrae, backward curvature of the crestal vertebrae, and thoracic deformity can significantly reduce lung capacity and maximum air exchange, and patients can often experience chest tightness, shortness of breath, and difficulty in whistling.