Thinning hair in women can be attributed to a variety of factors, many of which are directly or indirectly related to gynecological health. Common causes include hormonal imbalances, nutritional deficiencies, and certain medical conditions. For instance, conditions like polycystic ovary syndrome (PCOS), thyroid disorders, and menopause can lead to hair thinning. Stress, poor diet, and certain medications can also contribute to this issue.