How long does it take for hair to grow back after radiation therapy?

answered:

Not applicable

Baldness
Generally radiation dose not cause hair loss, only during brain radiation. This is usually an issue with chemotherapy after chemotherapy it usually takes 3 weeks to notice hair growth, but several months to "regain" your hair
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answered:

If permanent loss

Radiation_therapy
due to higher dose (> 50 Gy), and after lower doses, for instance, prophylactic brain treatment in small cell (25 Gy), I cousel my patients that peach fuzz in 3-4 months, and full return in 6 months.
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