Chemotherapy drugs are powerful enough to kill rapidly growing cancer cells, but they also can harm perfectly healthy cells, causing side effects throughout the body.
Cancer cells divide more quickly than healthy cells, and chemotherapy drugs effectively target those cells. Unfortunately, fast-growing cells that are healthy can be damaged too. There are many different chemotherapy drugs with the potential for many different side effects. These effects vary from person to person and from treatment to treatment.
Factors that play a role in side effects include other ongoing treatments, previous health issues, age, and lifestyle. Some patients experience few side effects while others feel quite ill. Although most side effects clear up shortly after treatment ends, some may continue well after chemotherapy has ended, and some may never go away.
Chemotherapy drugs are most likely to affect cells in the digestive tract, hair follicles, bone marrow, mouth, and reproductive system. However, cells in any part of the body may be damaged.