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Researchers are developing more effective therapies aimed at reducing the side effects of cancer treatments. This is important given that the number of cancer patients is expected to continue increasing.

Any problem that affects your healthy tissue and organs and arises as a result of cancer treatment is called a cancer treatment side effect. Side effects can vary from person to person and from treatment to treatment, to the extent that two people receiving the same treatment may experience very different side effects.

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Some experience side effects that arise during treatment and improve over time; however, some people experience severe side effects that last for months or even years after treatment is completed.

If you are experiencing any side effects from your cancer treatment, it is essential to discuss them with your doctor. Managing side effects is vital for cancer, post-cancer, and mental health care, and it helps to improve your quality of life.

“Everybody is different, but there are common themes related to the side effects of treatment, like weight gain,” says Tara Sanft, MD, Yale Medicine medical oncologist and director of the Survivorship Program at Yale Cancer Center and Smilow Cancer Hospital.
Other side effects related to cancer treatment include chronic fatigue, which makes it challenging to resume or start an exercise regimen, issues with intimacy, and sexual side effects.

Some of the most common side effects of cancer and its treatment include pain, anemia, oral issues, nausea, weight changes, dietary problems, and issues with hair, skin, and nails, as well as insomnia and fatigue.


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  • Pain. The term “pain” describes a broad category of symptoms that are common to all cancers and cancer treatments.
  • Pain significantly interferes with your quality of life by making it challenging or almost impossible to eat, sleep, and socialize.
  • It’s crucial to recognize that your pain can and should be treated.
  • Treatment options include pain medication and various therapies such as acupuncture, massage, psychological and physical therapy, as well as surgery.



  • Fatigue. Cancer-related fatigue (CRF) is a severe form of fatigue that many people describe as overwhelming tiredness, exhaustion, and weakness that does not improve with sleep or rest.

  • Fatigue is arguably the most common and distressing symptom of cancer treatment.
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Anemia. Anemia develops when insufficient red blood cells carry oxygen throughout the body. This can cause dizziness, weakness, faintness, and heart racing.

Treatments that can cause anemia include chemotherapy, radiation therapy, and some immunotherapies. This happens because these treatments can inadvertently destroy healthy red blood cells in the process of killing cancer cells.


What are some other side effects of cancer treatment?

  • Bleeding and bruising
  • Bone density loss
  • Edema (swelling)
  • Heart damage
  • Lymphedema (lymphatic system blockage)
  • Fertility issues
  • Memory or concentration problems, or delirium
  • Nerve problems
  • Sexual health issues
  • Sleep disturbances and insomnia
  • Urinary issues
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