The following are the most common symptoms for lung cancer. However, each individual may experience symptoms differently. Lung cancer usually does not cause symptoms when it first develops, but symptoms often become present after the tumor begins growing. A cough is the most common symptom of lung cancer.
Other symptoms can be caused by substances made by lung cancer cells, which is referred to as a paraneoplastic syndrome. For example, certain lung cancer cells produce a substance that causes a sharp drop in the level of sodium in the blood, which can cause many symptoms, including confusion and sometimes even coma. None of these symptoms is a sure sign of lung cancer. Only a doctor can tell whether a patient’s symptoms are caused by cancer or by another problem. Consult your doctor for a diagnosis.