Late and long-term effects

Some side effects of cancer treatment can last a long time or show up years later, depending on the treatment you had.

Rosa: Hi, I'm Rosa. Some treatment effects can last, or show up years later. Let's learn what to watch for, so you can catch them early.

Long-term effects are side effects that start during treatment and last after it ends. Late effects are problems that show up months or years after treatment. Not everyone gets them. Your risk depends on the type of treatment, the amount, the part of the body treated, and your age.

Knowing your risks helps you and your doctors watch for problems and treat them early. Your survivorship care plan should list the late effects you are at risk for.

Some effects are physical, like tiredness, pain, or numbness. Others affect thinking or memory, sometimes called chemo brain. Many people find these get better over time, and there are ways to help.

Tell your doctor about any new or lasting problems. Do not assume you just have to live with them. Many late effects can be managed.

Heart

Some chemotherapy, targeted drugs, and radiation to the chest can weaken the heart or affect blood vessels. You may need heart checks.

Lungs

Some chemotherapy, immunotherapy, and radiation to the chest can scar the lungs. Tell your doctor about shortness of breath or a lasting cough.

Nerves

Some chemotherapy can cause numbness, tingling, or pain in the hands and feet, called neuropathy.

Bones

Hormone treatments, steroids, and early menopause can thin the bones. You may need a bone density scan.

Fertility

Some treatments affect the ability to have children. Ask about fertility testing and options, even after treatment.

Second cancers

Some chemotherapy and radiation can slightly raise the risk of a new, different cancer years later. Keep up with screening.

Hormones and thyroid

Some treatments, like radiation to the neck or immunotherapy, can affect the thyroid or other glands.

Fatigue and thinking

Tiredness and trouble with memory or focus can last a while. Exercise, sleep habits, and therapy can help.

• Ask: Which late effects am I at risk for from my treatment?
• Ask: What tests should I have to check for them?
• Tell every new doctor about the cancer treatment you had.
• Report new symptoms, even years after treatment.

Last updated: 2026-10-27. Medically reviewed by Veli Bakalov, MD, medical oncologist (October 2026). General education from Step by Step, the patient portal of HemeOncBuddy.