Medical conditions that cause symptoms similar to polycystic ovary syndrome (PCOS) include:

• High prolactin hormone levels.
• Excess adrenal hormones. This excess level may be present from birth (congenital adrenal hyperplasia) or may develop in adulthood, causing irregular menstrual cycles and excess hair growth (hirsutism).
• Cushing's syndrome.
• Tumors of the ovary or adrenal gland that produce male hormones.
• Thyroid problems, such as autoimmune thyroiditis, hypothyroidism, or hyperthyroidism.
• Eating disorders.