Like most drugs, chemotherapy drugs have side effects. It is easy to confuse these side effects with the symptoms of cancer. Different medications have different short and long-term side effects. Not all chemotherapy drugs cause all side effects. Chemotherapy usually damages cells that are dividing, those parts of the body where normal cells frequently divide. The mouth, intestines, skin, hair, bone marrow are commonly affected. Hair grows all the time. The skin is constantly renewed. The same happens with the walls of the mouth and the digestive system, for this, all these tissues must constantly divide to produce new cells and this makes the symptoms temporary (during treatment).