Hair loss is a common problem affecting both men and women. It can be caused by a variety of factors such as genetics, stress, hormonal changes, nutritional deficiencies and scalp conditions. In men, it is often associated with androgenetic alopecia, due to genetic and hormonal factors, while in women there may be hormonal changes related to pregnancy, menopause or thyroid disease. The diagnosis of the causes of hair loss is based on a detailed trichological examination, which involves a thorough analysis of the condition of the scalp and hair using specialised instruments such as a trichoscope. Through these examinations, the specialist trichologist can determine the causes of hair loss and recommend appropriate treatment methods.