Common causes of low bone density include osteoporosis, osteochondrosis, bone cancer and so on. According to the causes, corresponding treatments should be taken, and the main treatments include general treatment, physical therapy, medication and surgery. 1. Osteoporosis: change the lifestyle, increase sunbathing, and have a balanced diet. Appropriate calcium supplements such as calcium gluconate and vitamin D3 can increase calcium absorption. Commonly used drugs such as alendronate inhibit osteoclasts; eg calcitonin inhibit bone resorption. 2. Osteochondrosis: more rest, less exercise. Those with pain can be given non-steroidal anti-inflammatory drugs such as ibuprofen, etc., glucocorticoid such as dexamethasone, etc., and surgery such as osteotomy can be used for serious cases. 3. Bone cancer: Surgery is the main treatment, while chemotherapy can improve the survival rate and limb preservation rate of bone cancer patients, commonly used chemotherapeutic drugs such as cyclophosphamide, etc. Radiotherapy can reduce the local recurrence rate of some patients, and those who cannot be operated can be treated with radiotherapy alone. There may be other reasons for low bone density, such as bone cysts. It is recommended to go to the hospital in time, after clarifying the cause of the disease, and standardize the treatment under the guidance of doctors. The above drugs should be used under the guidance of a doctor, avoid self-medication.