There are several factors that increase the risk of lung cancer.

Smoking is the largest risk factor for lung cancer and is held accountable for the majority of the lung cancer cases in the world.

Apart from this secondhand smoke, air pollution, and exposure to chemicals like radon, asbestos also cause cancer in lungs.

Occupational exposure to certain substances which are carcinogenic in nature also increase the risk of lung cancer.

Lung cancer is treatable at an early stage, which makes it important to identify the disease.

Here are few unusual symptoms associated with lung cancer: