Lung Cancer
Lung cancer is a type of cancer that begins in the lungs. There are two types of lung cancer based on the appearance of lung cancer cells under the microscope: small cell lung cancer which occurs almost exclusively in heavy smokers and is less common than non-small cell lung cancer, and non-small cell lung cancer is an umbrella term for several types of lung cancers that behave in a similar way. Non-small cell lung cancers include squamous cell carcinoma, adenocarcinoma and large cell carcinoma.
Signs and symptoms of lung cancer may include:
- A new cough
- Changes in a chronic cough or "smoker's cough"
- Coughing up blood, even a small amount
- Chest pain
- Wheezing and shortness of breath
- Repeated respiratory tract infections
- Hoarseness
- Unexplainable weight loss
- Bone pain
- Headache
Causes of lung cancer
Smoking is the single major cause of lung cancer, and the risk of developing lung cancer increases according to the length of time and number of cigarettes you have smoked. However, there are additional risk factors for developing this disease. A family history of lung cancer will increase the likelihood of developing cancer, as well as excessive alcohol consumption. In addition certain lung diseases, such as chronic obstructive pulmonary disease may increas the risk of developing lung cancer.