In the early stages, lung cancer may not show obvious symptoms, or the symptoms might be similar to those of other common illnesses, making it easy to overlook.
A persistent cough, especially in non-smokers, may be an early sign of lung cancer. The cough can gradually worsen and may be accompanied by phlegm or blood.
Lung cancer can affect the normal function of the lungs, causing shortness of breath or difficulty breathing.
Lung cancer may lead to pain or discomfort in the chest wall or within the chest cavity.
When lung cancer affects nearby structures, it can cause difficulty swallowing.
Lung cancer can spread through the bloodstream to other parts of the body, including the brain, leading to headaches.
Unexplained weight loss may be a symptom of lung cancer.