Hello, I am Dr Mittal. I have read your message. I think I can help you. The symptoms of the query are not conclusive. It can be due to the following possibilities- 1. the long standing cough can lead to the muscles of the chest to get tired and fatigued. This can in turn lead to pain, increased when you cough. 2. there might be an inflammation of the covering of the wall of the lungs, called pleura. This also leads to long standing cough and increased pain when you cough. 3. cough when long standing, can possibly due to infective agents like TB. It needs to be considered to be treated well. The lung infections like TB can affect other parts of the body as well. And needs to be treated separately. 4. Since there is a left sided chest pain, a cardiac cause like rheumatic heart disease causing symptoms of pulmonary edema will need to be considered as well. As I have said, more than one causes are possible for your symptoms. Hence you need to be evaluated further. A good repeat clinical examination is needed whereafter the investigations can be planned. Some of the possible investigations needed are Chest x ray, HRCT or CECT Chest, EKG, echocardiography and pleural biopsy if needed. As you can see the tests are quite a few. Therefore a repeat physical examination is needed to know which tests are needed. I have tried to make it as simple as possible. Please do ask a follow up query if you need a clarification on any issue. Meanwhile try simple painkillers like paracetamol, they may help relieve muscular pain. Take them with an antacid. Best wishes, Dr Mittal