PCOS is a hormonal disorder common in women of reproductive age that can cause irregular periods, difficulty conceiving, excess hair growth and acne. The exact cause is unknown but factors like genetics and insulin resistance play a role. Symptoms include irregular periods, hirsutism, hair loss and acne. Diagnosis involves exams, blood tests and ultrasounds to check hormone levels and examine ovaries. Treatment involves medication and lifestyle changes like diet and exercise to manage symptoms and make conception more likely.