Chemotherapy is a type of cancer treatment. It can result in hair loss due to damage to hair follicles - these are the cells that make hair. Suggest how this treatment works and why it often causes hair loss.

This is because chemotherapy targets rapidly-dividing cells throughout the body, aiming at the cancer but also affecting the healthy cells that produce hair on the scalp and all over the body.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.