Densely hairy women may be caused by endocrine disorders, heredity, diseases such as polycystic ovary syndrome and other reasons. 1. Endocrine disorders: If women do not pay attention to their living habits and hygiene in their daily life, often stay up late or have big emotional changes, it will easily lead to endocrine disorders resulting in excessive secretion of androgens, which will in turn lead to the emergence of dense hair and other symptoms. 2. Heredity: If the parents themselves are hairy, the next generation can also appear hairy phenomenon. Generally is normal, will not cause obvious impact on the body, do not need to scrape. 3. Diseases: Polycystic ovary syndrome, a common reproductive endocrine metabolic disease, may be affected by genetic and environmental factors. Due to endocrine disorders, patients may have symptoms of hyperandrogenism, which can be manifested as hair loss, hairiness, masculinized signs and other phenomena. In addition, hairy women can also be seen in other cases, it is recommended that patients go to the hospital to identify the cause of the disease in a timely manner, and follow the doctor’s instructions for treatment, to avoid delaying the condition.