Chemotherapy is the use of drugs to destroy cancer cells. It usually works by keeping the cancer cells from growing, dividing, and making more cells. Because cancer cells usually grow and divide faster than normal cells, chemotherapy has more of an effect on cancer cells.

The most common way that chemotherapy drugs are given is through a needle into a vein. This is called intravenous or IV chemotherapy. Chemotherapy can also be taken as a pill, capsule, or liquid by mouth, as an injection or shot, or as a cream that is put directly on your skin.

Metastatic cancer is considered stage IV. Chemotherapy is used to treat advanced-stage breast cancer by destroying or damaging the cancer cells as much as possible. Because chemotherapy medicines affect the entire body, chemotherapy is commonly used to treat advanced-stage breast cancer.

Chemotherapy may cause hair loss all over your body — not just on your scalp. Sometimes your eyelash, eyebrow, armpit, pubic and other body hair also falls out. Some chemotherapy drugs are more likely than others to cause hair loss, and different doses can cause anything from a mere thinning to complete baldness.

"Chemotherapy is an aggressive form of chemical drug therapy meant to destroy rapidly growing cells in the body. It’s usually used to treat cancer, as cancer cells grow and divide faster than other cells. A doctor who specializes in cancer treatment is known as an oncologist. They’ll work with you to come up with your treatment plan. Chemotherapy is often used in combination with other therapies, such as surgery, radiation, or hormone therapy. The use of combination therapy depends on: the stage and type of cancer you have

• your overall health
• previous cancer treatments you’ve had
• the location of the cancer cells
• your personal treatment preferences

It’s considered a systemic treatment, which means it affects the entire body. Chemotherapy has been proven to effectively attack cancer cells, but it can cause serious side effects that can severely impact your quality of life. You should weigh these side effects against the risk of going untreated when deciding if chemotherapy is right for you. There’s also the chance of developing a second cancer as a result of chemotherapy. Before beginning treatment, talk to your doctor about the possible risks and what symptoms you should be aware of.