Chemotherapy is a broad term encompassing various drugs used in cancer treatment. Traditional chemotherapy drugs work by inhibiting the growth and proliferation of tumor cells or by directly causing cell death. These drugs typically circulate throughout the body via the bloodstream, targeting tumor cells. However, in cancer treatment, not only these types of drugs are used, but also medications with different mechanisms, such as hormonal therapies, targeted therapies, and biological therapies that boost the immune system. Targeted therapies, in particular, inhibit tumor cell growth by specifically targeting their unique characteristics. The side effects of all these medications vary significantly depending on the type of drug used and the patient's individual characteristics.