4 doctors weighed in:
How long will it take for hair to grow back after receiving radiation therapy on the head?
4 doctors weighed in

Dr. Michael Thompson
Internal Medicine - Hematology & Oncology
2 doctors agree
In brief: Yes.
Radiation or chemotherapy drugs are toxic to cells that are rapidly dividing.
This means they specifically target cancer cells, but they also kill healthy cells that grow quickly. This includes hair cells (causing baldness/alopecia) and stomach cells (causing nausea or mucositis). Once the chemo or radiation is stopped, the side effects go away and hair should grow back.

In brief: Yes.
Radiation or chemotherapy drugs are toxic to cells that are rapidly dividing.
This means they specifically target cancer cells, but they also kill healthy cells that grow quickly. This includes hair cells (causing baldness/alopecia) and stomach cells (causing nausea or mucositis). Once the chemo or radiation is stopped, the side effects go away and hair should grow back.
Dr. Michael Thompson
Dr. Michael Thompson
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Dr. Brian Lawenda
Radiation Oncology
In brief: Depends on the dose
The scalp hair follicles generally regrow hair if the dose they received was less than 45 gy.
Your radiation oncologist can determine the actual dose delivered to the scalp by reviewing the plan. If the hair is going to grow back, it usually starts within a few weeks to a couple of months after treatment.

In brief: Depends on the dose
The scalp hair follicles generally regrow hair if the dose they received was less than 45 gy.
Your radiation oncologist can determine the actual dose delivered to the scalp by reviewing the plan. If the hair is going to grow back, it usually starts within a few weeks to a couple of months after treatment.
Dr. Brian Lawenda
Dr. Brian Lawenda
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