Pain under the breast of a man with hemiplegia may be caused by various reasons, such as musculo-neurogenic pain, crashing pneumonia and pleurisy, etc. A comprehensive diagnosis is needed according to the condition. 1. Musculo-neuropathic pain: Because hemiplegic patients are bedridden for a long time and keep the same posture for a long time, it may lead to local nerve compression, and the muscles innervated by them will have soreness and distension. 2. Accumulative pneumonia: When the patient is bedridden for a long time, the respiratory secretions cannot be discharged normally and will accumulate in the lungs, thus triggering the propagation of pathogens and leading to inflammation of the lungs. Patients will frequently cough up sputum, shortness of breath and other symptoms. 3. Pleurisy: It can be caused by infectious diseases, autoimmune diseases and malignant tumors, and is often triggered when the original disease is in poor condition. Symptoms are mainly chest pain and chest tightness. It is recommended that patients go to the hospital for relevant program examination to clarify the cause, and treat the symptoms under the guidance of the doctor. And actively treat the primary disease.