Back triangle pain may be caused by overwork, local soft tissue infection, frozen shoulder, etc. It can be treated by proper rest or using drugs such as amoxicillin capsule and celecoxib capsule under doctor’s guidance. 1. Overwork: In daily life, prolonged overwork may cause local soft tissue to be stretched and pain in the back triangle, which can be relieved by proper rest. 2. Local soft tissue infection: in daily life, if the trauma is not treated in time, it may lead to soft tissue injury and infection, due to the stimulation of inflammation, which will easily lead to the symptoms of pain. Amoxicillin capsules, levofloxacin tablets and other drugs can be used under the guidance of the doctor for treatment. 3. Frozen shoulder: it is usually caused by degenerative lesions of the shoulder joint and the surrounding soft tissues. When overworked, it may stimulate the local tissues, thus causing pain in the back triangle. It can be treated with medicines such as Loxoprofen sodium tablets and Celecoxib tablets as prescribed by the doctor. Patients once the back triangle pain, may also be related to a long time a posture and other factors, a single symptom can not determine the specific cause, it is recommended to go to the hospital in time for examination, follow the doctor’s instructions to use drugs, do not blindly use drugs.