Chemotherapy for Cancer: Things You Should Know

A healthy body constantly produces new cells through a controlled process of growth and division. In cancer, some cells begin to grow out of control, forming tumors or crowding out normal cells.

Chemotherapy is one way to stop these cells from growing rapidly—using anti-cancer (cytotoxic) medicines. “Cytotoxic” means cell-killing, and these medicines are designed to affect fast-growing cells, including cancer cells.

Chemotherapy for cancer can be used alone or with other treatments, depending on the type and stage of cancer. Your oncology team will explain how it fits into your overall care plan.

How Does Chemotherapy Work?

Chemotherapy works by killing cancer cells or stopping them from multiplying. Because cancer cells often grow and divide quickly, they are especially sensitive to these medicines.

At the same time, chemotherapy medications may also affect some of your body's healthy cells, especially those that grow quickly. This is why side effects can happen during treatment.

Many side effects often improve after treatment is completed, though everyone’s experience is different. Your oncology team will discuss the goals of chemotherapy in your specific case, which may include curing the cancer, controlling its growth, or easing symptoms.

Treatment Cycles and Schedules

Chemotherapy is normally administered in a series of sessions, with rest breaks in between. One round of treatment followed by a rest period is called a cycle.

These rest periods give your body time to recover from side effects. They also allow your blood cell counts to recover before the next cycle begins.

Chemotherapy schedules vary widely depending on the type of cancer, the medicines used, and how your body responds. Your oncologist will tell you how many cycles are planned and what to expect during each stage.

How is Chemotherapy Given?

Chemotherapy can be administered in different ways, depending on your treatment plan. Many people receive chemotherapy as an outpatient, meaning they do not stay overnight, while others may receive treatment in a hospital or at home.

Common methods include:

In some cases, chemotherapy may be given directly into a body cavity, such as the bladder, depending on the cancer type.

If you are prescribed oral chemotherapy to take at home, it is important to take the medication exactly as directed. If you miss a dose or are unsure what to do, contact your care team for instructions.

Other Cancer Treatments Used With Chemotherapy

Chemotherapy is often part of a broader cancer treatment plan. Other treatments may be used before, during, or after chemotherapy.

Surgery involves removing a tumor from the affected area. Chemotherapy may be given before surgery (neoadjuvant chemotherapy) to help shrink a tumor or after surgery (adjuvant chemotherapy) to target remaining cancer cells.

Radiation therapy treats cancer using high-energy radiation to damage cancer cells. Some immunotherapies (biological therapies), including certain antibodies and cancer treatment vaccines, are designed to help the immune system recognize and target cancer cells.

Your oncologist will guide and recommend the best treatment combination for your individual situation.

How to Prepare for Chemotherapy

Learning about chemotherapy for cancer and its possible effects can help you feel more prepared. Because chemotherapy may make you feel tired, planning ahead can make daily life easier during treatment.

Plan for your day-to-day needs:

You may also want to speak with your oncology team about:

Before beginning chemotherapy, your medical professional may recommend certain tests to ensure your body is ready for treatment.

Tests and Screenings Before Each Cycle

Your oncologist or nurse will discuss any tests, scans, or check-ups you may require before starting chemotherapy and before some treatment cycles. The specific tests depend on your treatment plan and overall health.

Common tests may include:

Before many treatment cycles, you may be asked to give a blood sample. These tests help your care team decide whether it is safe to proceed with the next cycle.

If you are unsure why a test is being ordered, ask your team to explain its purpose and how the results may affect your schedule.

Side Effects of Chemotherapy

Chemotherapy treatment may cause side effects, but these vary from person to person. Some people experience several side effects, while others have few or mild symptoms.

Common side effects include:

Other side effects may include easy bruising or bleeding, and diarrhea. Chemotherapy is meant to stop cells from multiplying rapidly, and because some healthy cells also grow quickly, they may be affected during treatment.

For some people, certain effects can last for months or even appear years after chemotherapy. Any new, worsening, or concerning symptoms should be reported promptly to your oncology team.

After Care and Ongoing Monitoring

The success of your treatment will be regularly monitored by your doctor and cancer care team. Screening tests and blood tests are often done routinely to assess how you are responding to chemotherapy.

Clear communication with your oncologist during and after your treatment is essential. Share any side effects, emotional challenges, or practical concerns so your team can respond appropriately.

Chemotherapy can take a lot from a person physically and mentally, and decisions about treatment involve weighing potential benefits and risks. Your oncology team will help you understand your options and guide you toward the approach that aligns with your needs and goals.