Many people who undergo chemotherapy or radiation treatments suffer from hair loss. That's because while these treatments kill cancerous cells, they also kill healthy cells, including the ones that facilitate hair growth. This hair loss is known as alopecia (al-lo-PEE-sha). Most alopecia that results from cancer treatment isn't permanent, with the exception of some cases associated with radiation therapies. Once the therapy is over, hair growth usually resumes quickly and a full head of hair should grow back within four months. Coping with hair loss can be very difficult, but some things can help with the transition. If you know you're going to undergo treatments that will cause hair loss, shop for a wig before the treatments begin. It's also good to have a variety of hats and headwear. And, address the psychological effects of hair loss with clinical counseling. For more information about how to deal with hair loss from cancer, contact an oncologist in your area.