Illnesses that can have the same symptoms of lung cancer include chronic obstructive pulmonary disease, pneumonia, pulmonary embolism, tuberculosis and cystic fibrosis, according to the Mayo Clinic. Other illnesses whose symptoms can mimic those of lung cancer include emphysema, mitral valve stenosis and Wegener's granulomatosis.
These diseases all share the coughing up of blood, or hemoptysis, as a symptom, claims the Mayo Clinic.
Chest pain is another symptom of lung cancer, according to WebMD. Other diseases that have chest pain as a symptom include pneumonia, lung abscess, pleurisy and pulmonary embolism. Pneumothorax can also cause chest pain. This condition occurs when an injury causes a lung or part of a lung to collapse.