External beam radiation uses high-powered beams of energy to kill cancer cells. Beams of radiation are precisely aimed at the cancer using a machine that moves around your body. Radiation therapy for breast cancer uses high-energy X-rays, protons or other particles to kill cancer cells. Rapidly growing cells, such as cancer cells, are more susceptible to the effects of radiation therapy than are normal cells. The X-rays or particles are painless and invisible.

Side effect of COVID-19 vaccine mirrors breast cancer symptom, doctors say



What are the Side Effects of Aromatase Inhibitors
Hormones are substances that function as chemical messengers in the body. They affect the actions of cells and tissues at various locations in the body, often reaching their targets through the bloodstream. The hormones estrogen and progesterone are produced by the ovaries in premenopausal women and by some other tissues, including fat and skin, in both premenopausal and postmenopausal women and in men. Estrogen promotes the development and maintenance of female sex characteristics and the growth of long bones. Progesterone plays a role in the menstrual cycle and pregnancy. Estrogen and progesterone also promote the growth of some breast cancers, which are called hormone-sensitive or hormone-dependent breast cancers.


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Tell your doctor about side effects you are experiencing, so you get the care and treatment you need to manage these problems. Cancer treatments and cancer can cause side effects. Side effects are problems that occur when treatment affects healthy tissues or organs. Speak up about any problems you have. Keep in mind that side effects vary from person to person, even among people receiving the same type of cancer treatment.



Everyone is different and side effects can vary from person to person. Do talk to your healthcare team if you are worried about your side effects or have any questions. These can start after a couple of weeks of treatment. They continue to get worse during the treatment and after the treatment has finished.