ocr: Medical teatueuts Hair loss Hair loss can be one of the most traumatic side-effects of cancer therapy, but if you're prepared forit, you can help to - minimize its unpleasantness. It occurs most commonly with some types of chemotherapy, but will occur in those parts of the body to which radiation is given, for example, the head, the armpits, or the pubic area. Radiation hair loss may be permanent, depending on the dose given. Discuss this with your oncologist.