4 doctors weighed in:
Why do people feel sick after radiotherapy?
4 doctors weighed in

Dr. Martin Rubenstein
Internal Medicine - Hematology & Oncology
2 doctors agree
In brief: It injures your body
Radiation therapy kills cancer cell but can also damage the normal structures of the body.
Most people getting radiation complain of fatigue. What other problems there are depend on what body part is treated. The skin gets a sort of bad sun burn. If the stomach is treated, there can be nausea, diarrhea if the colon is treated, and cough if the lung is treated. This all is usually temporary.

In brief: It injures your body
Radiation therapy kills cancer cell but can also damage the normal structures of the body.
Most people getting radiation complain of fatigue. What other problems there are depend on what body part is treated. The skin gets a sort of bad sun burn. If the stomach is treated, there can be nausea, diarrhea if the colon is treated, and cough if the lung is treated. This all is usually temporary.
Dr. Martin Rubenstein
Dr. Martin Rubenstein
Thank
Dr. Brian Lawenda
Radiation Oncology
In brief: Depends
Most commonly, nausea may occur after radiating the stomach.
Radiation can cause inflammation in the tissues and nerves within and surrounding the stomach, which can lead to nausea. Some people do get nauseated after radiation to other areas of the body, but this is much less common. Anti-nausea medications are generally very effective.

In brief: Depends
Most commonly, nausea may occur after radiating the stomach.
Radiation can cause inflammation in the tissues and nerves within and surrounding the stomach, which can lead to nausea. Some people do get nauseated after radiation to other areas of the body, but this is much less common. Anti-nausea medications are generally very effective.
Dr. Brian Lawenda
Dr. Brian Lawenda
Thank
Read more answers from doctors