Chemotherapy is the use of drugs to treat rapidly growing cancer cells in an effort to destroy them. These drugs target all rapidly growing cells in order to eliminate the cancer, so they can also destroy healthy cells, including those in the blood, mouth, throat, stomach, and hair. This damage to healthy cells is responsible for most of chemotherapy's side effects. Most of the side effects of chemotherapy are short term, and rarely last much longer than treatment. These side effects can be uncomfortable and painful at times, but there are many ways you can manage and cope with them. Here are some common side effects of chemotherapy: