• PCOS, also known as Poly-Cystic Ovary Disorder (PCOD) occurs when a hormonal imbalance disrupts the ovulation process, which can lead to missed or irregular menstrual periods as well as other symptoms such as hirsutism ( excess facial and body hair), weight gain, insulin resistance, and hair loss. PCOS can lead to infertility and, as the name states, the development of cysts (small fluid-filled sacs) in the ovaries.