The most common cancer of the lungs is epidermoid. It is also known as squamous carcinoma because its cells look like a flat surface called a squamous cell. This cancer produces keratin, a substance found in skin and hair, which can be seen in a tumor. Squamous carcinoma is more common in smokers because it develops in the bronchi and spreads by invading local tissues, than to the lymph nodes and into the blood.

Large - cell carcinoma is a tumor that is fairly larger than other types. They don't form keratin but they are common in smokers. They develop in the central or peripheral part of the lungs and the lymph glands.

Small cell carcinoma tumors are small and fragile. They are divided into groups by their shapes. The term "oat cell carcinoma" is used to develop in smokers and usually in the central part of the lung. They spread by the l

ymph glands and into the blood stream early. This type of tumors can only be seen through an electron microscope on high magnification. A rare type of lung cancer, which develops from hormone producing cells are carcinoid tumors. They have a much less malignant course than small cell carcinoma.

About two in every 5 patients have a cough as their first symptom. Anyonw who has lung cancer develops a cough somewhere along the way. Anyone who has a continous cough should see there doctor. It is not good to just call it a "smokers cough". Cancer invading the mucus airways irritates the nerves which starts a cough and that cough usually doesn't remove the cancer so the cough becomes persistant. Any bleeding is very irritating to the lining of the bronchi and will cause blood to be coughed up. Coughing may occur if the irritation is severe and cannot be cleared. This can be servere enough to crack a rib and damage small blood vessels in the lungs. The cough caused by lung cancer is often most noticable at night and first thing in the morning.

Another type of treatment for lung cancer is chemotherapy. This is the use of drugs to trat cancer, While drugs ca be used to cure some cancer, only a minority of patients with lung cancer are responsive to drug treatment. There are a number of drugs which are able to shrink tumors at least by half. Although single - drug chemotherapy does cause tumor shrinkage it rarely prolongs life. Several drugs are being used in combninations now. Patients who are feeling very sick, who have lost a lot of weight or who have had prior radiotherapy are likely to respond pooly to drug therapy.

The second most common symptom occuring in about 1 in 5, is a chest infection. This is due to an inflammation of the lining over the lungs. A chest infection may cause chills, fever, night sweats, loss of appetite and weight. Infections may not respond to antibiotics and if complete blockage occurs the patient may expieriance shortness breathe, cough and a fever may rapidly develop. Symptoms and their serverity depend on how much of the lung is affected.

Lung cancer has been blamed on many factors but the most important is smoking. Smoking is the main cause of lung cancer

Some common words found in the essay are:
Cancer Lung, lung cancer, cell carcinoma, chest ray, chest infection, smokers develop, smokers develop lung, treatment lung cancer, develop lung cancer, lung cancer develops, cancer lungs, common smokers, cause lung cancer, squamous carcinoma, treatment patient, cancer develops,
Approximate Word count = 1504
Approximate Pages = 6 (250 words per page double spaced)