Cancercan start almost anywhere in the human body, which is made up of trillions of cells. Cancercan is a serious condition caused by the uncontrolled growth of cells within various systems of the body that cause severe pain, decreased body function, and eventual death if left untreated. Tumors can grow and interfere with the digestive, nervous, and circulatory systems, and they can release hormones that alter body function. Cancer medications operate by preventing the reproduction of these cells to eliminate the condition or to slow the spread of cancer making other treatment such as chemotherapy, radiotherapy, or surgery more effective. Many cancer medications focus on one type of condition and are prescribed according to your individual case. Sometimes, the process of cell growth goes wrong and new cells form when the body doesn’t need them and old or damaged cells do not die as they should.