Chemotherapy is a name for a group of drugs that are used together to fight Hodgkin's lymphoma and other types of cancers. They are taken orally or administered intravenously. Chemotherapy drugs travel through your bloodstream and can reach any part of your body where your Hodgkin's lymphoma may be growing. Because they fight rapidly growing cells in your body, including those that are cancerous and healthy, they can cause side effects such as fatigue, hair loss, nausea, and infertility. Doctors are working to find drugs that fight cancer without causing these kinds of problems.