Cancer is a group of diseases involving weird cell growth with the potential to invade or spread to other parts of the body. Possible signs and symptoms include: a new lump, abnormal bleeding, a prolonged cough, unexplained weight loss, and a change in bowel movements, among others. While these symptoms may indicate cancer they may also occur due to other issues.
There are over 100 different known cancers that affect humans.Tobacco use is the cause of about 22% of cancer deaths. Another 10% is due to obesity, a poor diet, lack of physical activity, and drinking alcohol. Other factors include certain infections and exposures to radiations. In the world nearly 20% of cancers are due to infections such as hepatitis B, hepatitis C, and human papillomavirus (pretty much the things you get vaccinated for). These factors act, at least partly, by changing the genes of a cell. Typically many such genetic changes are required before cancer develops. Approximately 5–10% of cancers are due to genetic defects inherited from a person’s parents.
Cancer can be detected by certain signs and symptoms or screening tests. It is then typically further investigated by medical imaging. Cancer is a really complicated thing and hasn’t had a cure yet for most cancers. I chose this topic because cancer is a really big world issue and many people die from it each year. It is also very interesting because most diseases that I know of have a cure and cancer so far, doesn’t.