1. Polycystic ovary syndrome (PCOS) is a hormonal disorder that causes enlarged ovaries and high levels of androgens, leading to irregular periods, acne, and weight gain.
2. Premature ovarian failure (POF) occurs when a woman's ovaries stop functioning before the age of 40, resulting in infertility, hot flashes, and vaginal dryness.
3. Hypothyroidism, a condition in which the thyroid gland does not produce enough hormones, can cause irregular periods, weight gain, and decreased sex drive in women.