For more information on the menstrual cycle and topics that affect women’s health, please choose from the following list of trusted sources:

• American Academy of Family Physicians (AAFP)
  www.aafp.org
  
  
• American Academy of Nurse Practitioners (AANP)
  www.aanp.org
  
  
• American Academy of Physician Assistants (AAPA)
  www.aapa.org/
  
  
• American Association of Clinical Endocrinologists (AACE)
  www.aace.com
  
  
• American College of Physicians (ACP)
  www.acponline.org
  
  
• American Medical Association (AMA)
  www.ama-assn.org
  
  
• American Society for Reproductive Medicine (ASRM)
  www.asrm.org
  
  
• Association of Professors of Gynecology and Obstetrics (APGO)
  www.apgo.org
  
  
• Association of Reproductive Health Professionals (ARHP)
  www.arhp.org
  
  
• FDA Office of Women’s Health (OWH)
  www.fda.gov/womens/default.htm
  
  
• MedlinePlus
  www.nlm.nih.gov/medlineplus
  
  
• National Women’s Health Information Center
  www.womenshealth.gov/
  
  
• Society for Women’s Health Research (SWHR)
  www.womenshealthresearch.org
  
  
• The American College of Obstetricians and Gynecologists (ACOG)
  www.acog.com
  
  
• The Hormone Foundation
  www.hormone.org