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(2)Cancer is a disease characterized by out- of- control cell growth. There are five main categories of cancer: Carcinomas appears firstly in the skin or tissues, Sarcomas start up in the bones & cartilages, Leukemia dawn of in the blood and bone marrow, Lymphomas occurs in the immune system.Moreover,CNS cancer develops in the brain and spinal cord11.
(2.1)Causes of cancer:1)Lifestyle causing factors- (a) Tobacco is the frequent occuring cause of lung, bladder, mouth and stomach cancer,(b)Alcohol- It is the most critical origin of the esophageal cancer and it leads to the inflammation and cirrhosis of liver,(c)UV radiation- Sun’s exposure is the main cause of skin cancer.
2)Environmental factors-(a) Asbestos fibres- It is the association of naturally occuring fibrous material that are resistant to heat ; corrosion, it leads to the development of lung cancer,(b) Metal compounds and plastic chemicals also hike the exposure of cancer in the body.
(3)Radiation-(a) Ionizing radiation includes radon, x-rays, gamma rays,(b) Non-ionizing radiation such as visible light and sun’s uv rays.(
(4) Bacteria and viruses can cause cancer: Bacteria includes Helicobacter pylori and Chlamydia trachomatis and Viruses includes- HBV, HCV(Hepatitis viruses),HPV(Human pappiloma virus),EBV(Epstein Barr virus) and Herpes virus.12.

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