Hidden pain on the left side of the back may be caused by bone and soft tissue disorders, but also may be caused by digestive system diseases, respiratory system diseases, etc., and should be promptly consulted. 1. Bone and soft tissue diseases: frozen shoulder, fasciitis of the back, neck and shoulder syndrome and other diseases can be particularly painful discomfort on the left side of the back, with long-term muscle strain, chronic inflammation stimulation related to daily attention to work and study posture, if necessary, follow the doctor’s instructions oral ibuprofen, celecoxib and other medications for symptomatic treatment. 2. Digestive system diseases: gastric ulcer, esophagitis and other digestive system diseases may lead to the left side of the back pain, and the nerve involved in the pain, the patient is often accompanied by heartburn, dyspepsia and other symptoms, it is recommended to improve the gastroscopy examination to clarify the diagnosis. 3. Respiratory diseases: left pleurisy, pneumonia and other diseases of inflammation stimulation of the pleura, the patient may be manifested as the affected side of the back pain, should be combined with chest imaging to further clarify the cause of the disease. If the hidden pain on the left side of the back can not be relieved after resting, or recurring, it is recommended to consult a doctor in time to exclude the possibility of organic lesions under the guidance of the doctor.