This essay Lung Cancer has a total of 1426 words and 6 pages.
Lung cancer is a carcinoma that develops in the epithelial cells that form the interior lining to the lungs. The airways get the most exposure to inhaled pollutants, thus most people who get lung cancer are smokers. Lung cancer is not just one disease. There are many types of cancer that form in the lungs most of which you can only see through a microscope.
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 lymph 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.
Lung cancer has been blamed on many factors but the most important is smoking. Smoking is the main cause of lung cancer. The more often and longer a person smokes increases there chances of lung cancer. Cigarrettes are supposed to releive stress and depression, thirst and hunger. In reality they are only killing inside of you although you cant see it. Many people who have smoked for years figure the damage is already done so why quit. The risk of death from lung cancer is related to the number of smoked ciggarettes per day and the age the smoker started. There is only a small risk for non smokers to develop lung cancer. Although there is a risk of poeple who are around a lot of smokers from second hand smoke.
It has been suggested taht the association between smoking and lung cancer is genetiv rather than casual. Genetic influences may determine which smokers are more likely to develope lung cancer. Only a minority of smokers who develop lung cancer do so by inheritance. That alone makes them more suseptable to the cancer causing agents in cigarette smoke.
Another cause of lung cancer is air pollition. Coal smoke appears to be increased in the risk of lung cancer but it’s effects are small compared to that of smoking. Poeple who work in industries and that are exposed to asbestos dust, nickel, arsenic, radioactive materials, mustard gas and the products of coal and distillation are at an increased rate of developing cancer of the lungs.
Most causes of cancer are only discovered when someone goes to there doctor feeling ill. Some tumors can be found on a routine chest x - ray. Lung cancer in the early stage no signs of ill effects at all. As the tumor grows it starts to cause symptoms due to it’s invasion into the tissues of the lung and airways. Lung cancer is often suspected when someone coughs up blood or complains of a hacking cough that continues to get worse. What the lung is trying to do is get rid of the object that is lodged in the airway. I fhte tumor grows the patient will expeiriance chest pain anjd difficulty breathing. Often these symptoms are caused by a chest infection which doesn’t respond to the usual antibiotics and it is only when a chest x - ray is taken and the cancer is found.
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
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