Chemotherapy involves the use anti-cancer drugs. These drugs are either given intravenously (through the veins) or orally (by mouth). This type of treatment is extremely useful in cases where the cancer has spread to different parts of the body. These drugs work against the cells that divide quickly thereby slowing down the growth of cancer and its associated symptoms. Chemotherapy can affect the cells of other parts of the body such as the bone marrow, hair follicles, mouth, and intestines and can cause side effects. Some of the possible side effects include loss of appetite, nausea, vomiting, diarrhea, fatigue, mouth sores, and hair loss. Most of the side effects are temporary and disappear along with the discontinuation of chemotherapy. Some chemotherapy drugs can have more severe side effects and your doctor will explain to you the risks and benefits before starting your therapy.