The most common symptoms of low bone density are pain, spinal deformities, and fractures. 1. Pain: The most typical symptom of low bone density is lumbar and back pain, which usually increases after over-exertion, and in serious cases, dysfunction and limited activities will occur. 2. Deformation of the spine: Most people with low bone density will have deformation of the spine, hunchback and other symptoms. This is due to the low density of bones, which can not bear the weight of the body for a long time, resulting in compression and deformation of the spine. 3. Fracture: low bone density is very easy to cause osteoporosis, osteoporosis will cause a decrease in bone hardness, once the outside world collision or fall, it will be very easy to cause fractures. In addition to the above symptoms, low bone density may also have other symptoms, it is recommended to go to the hospital in time when there are serious symptoms to avoid delaying the condition.