There are about 200 different types of cancer. It can start in any type of body tissue. What affects one body tissue may not affect another. For example, tobacco smoke that you breathe in may help to cause lung cancer. Overexposing your skin to the sun could cause a melanoma on your leg. But the sun won't give you lung cancer and smoking won't give you melanoma.

Apart from infectious diseases, most illnesses (including cancer) are multifactorial. This means that there are many factors involved. In other words, there is no single cause for any one type of cancer.

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Flu Medicines Can Increase Spread of the Virus

Got the flu? Think twice before you pop a pill to feel better.
Most over-the-counter flu medications include a fever-reducing ingredient such as acetaminophen or ibuprofen. But suppressing fever, according to new research, actually increases the number of seasonal flu cases by at least 5 percent in the U.S., and could cause as many as 1,000 additional deaths from influenza nationally each year.

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