Cancer is a disease in which there is uncontrolled cell growth. Cancer harms the body when altered cells divide uncontrollably to form lumps or masses of tissue called tumors. Tumors can grow and interfere with the digestive, nervous, and circulatory systems, and they can release hormones that alter body function. Tumors that stay in one spot and demonstrate limited growth are generally considered to be benign. There are over 100 different types of cancer, and each is classified by the type of cell that is initially affected.
Clash of the fallen
When cancer begins, it invariably produces no symptoms. Signs and symptoms only appear as the mass continues to grow or ulcerates. Few symptoms are specific, with many of them also frequently occurring in individuals who have other conditions. Thus, it is not uncommon for people diagnosed with cancer to have been treated for other diseases, which were assumed to be causing their symptoms.
Though there are many different types of cancer, the common ones are the following:
Cancer is one of the leading causes of morbidity and mortality worldwide. The vast majority of cancer cases are due to environmental risk factors, and many, but not all, of these environmental factors are controllable lifestyle choices.
Cancer prevention is defined as active measures taken to decrease the risk of cancer. Cancer deaths can be prevented by avoiding risk factors including: tobacco, overweight / obesity, an insufficient diet, physical inactivity, alcohol, sexually transmitted infections, and air pollution. Not all environmental causes are controllable, such as naturally occurring background radiation, and other cases of cancer are caused through hereditary genetic disorders, and so it is not possible to prevent all cases of cancer.