The most common cause of hair loss is androgenetic alopecia, also known as male and female pattern baldness. It is hereditary, and it usually occurs gradually and in predictable patterns. However, not all cases of hair loss are caused by genetics. Your hair transplant surgeon will examine your scalp and reach a diagnosis. If your hair loss is not due to pattern baldness, one of the following may apply: Medical conditions such as thyroid problems, anaemia and autoimmune diseases Hormonal changes during pregnancy, childbirth or menopause Certain medications and supplements Stressful events Tight hairstyles – a condition called traction alopecia Nutritional deficiencies and Irresistible urges to pull hair from the scalp – a condition called trichotillomania.