Chemotherapy uses to destroy cancer cells.

It uses drugs. These drugs work by destroying or slowing down the growth of cancer cells. But it also destroys some healthy cells that help the growth of hair or the lining of lips. So it causes side effects, although these side effects go away when chemotherapy is over. When the chemotherapy completely destroys the cancer cells, so they can't divide, they can't grow. Hope i helped. Have a nice day.

Try tylenol or see a professional

Depends on which disease, but as a general rule eat healthy. many vegetables.                                                        hope my answer has come to your . you for posting your question here in we hope to answer more of your questions and inquiries soon. have a nice day ahead! : )     (p.s mark as brainliest if )