Yes. It is possible to improve hair growth and thickness through appropriate, long-term treatment, hormonal medications combination , topical solutions containing hormones, minoxidil solution, and hair growth-stimulating injections. Hair may not grow back 100%, but this treatment will be effective in reducing hair loss and increasing hair volume. Polycystic ovary syndrome is usually not diagnosed for five to ten years. So hair regrowth percentage depends on how long a person has had syndrome.