300 Longwood Avenue Boston, MA 02115 (617) 355-6000 My Child Has: Hormonal Problems Programs that treat this condition Reproductive Endocrine Practice   Adolescent/Young Adult Medical Practice   Both males and females can have hormonal imbalances. For example, females may have too much testosterone, which can cause problems such as excessive hair. Polycystic ovary syndrome (PCOS) is a hormone imbalance than can affect girls, causing irregular periods, acne, and excessive hair growth. Both boys and girls can have too much or too little thyroid hormone, cortisol, insulin, and other hormones. The information on this website should not be taken as medical advice, which can only be given to you by your personal health care professional. Copyright © Children's Hospital Boston. All rights reserved.