<human>: I want to know about the different types of cancer and how they affect the body.
<bot>: Cancer is a disease that affects cells in the body. It starts when these cells begin to grow out of control, forming tumors. These tumors can spread throughout the body and cause many different symptoms depending on where they are located. Some common symptoms include fatigue, weight loss, pain, and swelling. Treatment for cancer depends on the type and stage of the cancer, but often includes surgery, radiation therapy, and chemotherapy.