Lung cancer symptoms: four warning signs in your cough

Lung cancer develops when the cells in your lungs - the two spongy organs in your chest - divide uncontrollably. The cancer usually spreads to surrounding areas, such as the lymph nodes.

Lymph nodes are small glands that filter lymph, the clear fluid that circulates through the lymphatic system. LUNG CANCER - HOW TO TREAT IT The most common treatment options include surgery,

radiotherapy, chemotherapy and immunotherapy. Depending on the type of cancer and the stage, you may receive a combination of these treatments, according to the NHS. It is important to bear

in mind that different treatment options come with side effects. Chemotherapy, for example, which uses powerful cancer-killing medicine to treat cancer, can cause fatigue, sickness and hair

loss, notes the NHS. Chemotherapy can also weaken your immune system, making you more vulnerable to infection, adds the health site. LUNG CANCER - AM I AT RISK? Lung cancer is strongly tied

to unhealthy lifestyle decisions. The gravest risk factor is smoking tobacco, with around seven out of 10 lung cancers are caused by smoking, according to Cancer Research UK. This includes

breathing in other people’s cigarette smoke or even light or occasional smoking. As Cancer Research UK points out, your risk increases more the longer you smoke and the more you smoke so it

is imperative to stop smoking sooner rather than later. A lesser-known risk factor is air pollution. "The risk depends on the levels of air pollution you are regularly exposed to,"

explains Cancer Research UK. Although, at UK levels, the extra risk for each person is negligible, it adds.