Left shoulder pain with cough symptoms can be caused by left lung infection, left pneumothorax, coronary heart disease and other reasons. 1. Left lung infection: when the body’s immunity decreases and the left lung is infected by bacteria, viruses and other pathogens, it can lead to localized edema, congestion and exudation and other inflammatory reactions, which can cause coughing symptoms, and at the same time, it can be radiated to the left shoulder, resulting in pain in the left shoulder, and it is accompanied by chest tightness and fever, and other manifestations. 2. Left pneumothorax: traumatic rib fracture, the fracture end can form a pneumothorax when it pierces the pleural cavity, and spontaneous pneumothorax can occur in some thin people when they perform strenuous activities, which can lead to the left side of the normal lung tissues being compressed, and can cause coughing, pain in the left shoulder and other symptoms, accompanied by chest tightness, shortness of breath and other discomforts. 3. Coronary heart disease: Coronary artery stenosis can cause myocardial hypoxia and ischemia, which can lead to angina pectoris, myocardial infarction and other symptoms, and severe coronary heart disease can affect lung function, leading to cough, chest pain and other symptoms, and also in the left shoulder, radiating pain. 4. Other: left shoulder pain, cough symptoms may not be caused by the same cause, when the occurrence of respiratory tract infections, lung diseases, colds and other conditions, combined with frozen shoulder, shoulder soft tissue injuries, myofasciitis, cervical spondylosis and other conditions, can also appear in the left shoulder pain combined with the performance of pain. When left shoulder pain is accompanied by coughing, it is necessary to consult a doctor in time, after clarifying the cause of the disease, actively carry out appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.