Cancer

Cancer

The uncontrolled growth of abnormal cells produces a cell mass called tumor which can be benign or malignant. Malignant tumors are cancerous. These cancerous cells invade other tissues nearby and spread the malignancy to other parts of the body. This process of spreading cancer to other tissues/organs is called metastasis.

Cancer can develop in almost any tissue/organ of the body like lungs, kidney, skin, bone, colon etc. There are more than 100 types of cancer.

Causes

There are many types of cancer for which the cause remains unknown. However, causes for cancer can be,

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  • Exposure to benzene and other chemicals
  • Drinking excess alcohol
  • Environmental toxins, such as certain poisonous mushrooms and a type of poison that can grow on peanut plants (aflatoxins)
  • Excessive sunlight exposure
  • Genetic problems
  • Obesity
  • Radiation
  • Viruses

Symptoms

Symptoms differ based on the type and location of the cancer. Some cancers do not develop any symptom until the cancer reaches the advance stage like in the case of pancreatic cancer. In certain types of cancers no symptoms are evident at all. However, some symptoms are commonly seen in most types of cancers

  • Chills
  • Fatigue
  • Fever
  • Loss of appetite
  • Malaise
  • Night sweats
  • Weight loss

http://www.nlm.nih.gov/medlineplus/ency/article/001289.htm

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