Often people have no symptoms of lung cancer and it is only diagnosed after a chest X-ray. If symptoms do occur, they can differ according to the type of cancer. Squamous and small cell cancers are generally associated with cough, shortness of breath, bloody sputum, chest pain, wheezing and pneumonia. "There are three maintypes of treatment: surgery, radiotherapy and chemotherapy." Adenocarcinoma causes chest pain when breathing, cough and shortness of breath.