This article is from the Medical Education FAQ, by email@example.com (Eric P. Wilkinson, M.D.)with numerous contributions by others.
A good source for learning about the different medical specialties
is the American Board of Medical Specialties <http://www.abms.org>,
an organization that coordinates and approves changes in board
certification policy in the different medical fields. A complete
list of the certifying boards and the general and subspecialty
certificates that they offer can be found on their web site. A list
of the major medical specialties can be found below. No effort has
been made to list subspecialties.
Allergy & Immunology
Colon & Rectal Surgery
Obstetrics & Gynecology
Physical Medicine & Rehabilitation
Preventive Medicine (including Occupational Medicine)
Thoracic Surgery (including Cardiothoracic Surgery)