- ADHD : Adult
- AIDS / HIV
- Abnormalities see Genetic Disorders
- Abortion, Spontaneous see Miscarriage
- Accutane
- Achilles Tendonitis see Tendonitis
- Acid Reflux
- Acquired Immunodeficiency Syndrome see AIDS
- Adderall
- Addisons Disease
- Adenoids see Tonsils & Adenoids
- Adhesive Capsulitis see Frozen Shoulder
- Aging see Geriatrics
- Allergic Contact Dermatitis
- Allergies
- Alopecia see Hair Loss
- Alphavirus Pictures
- Alzheimer's Disease
- Amphetamines
- Anemia
- Anesthesiology
- Aneurysm
- Angina
- Ankylosing Spondylitis
- Anorexia
- Ant Bites
- Anthrax
- Antibiotic Resistance
- Aortic Aneurysm see Aneurysm
- Aplastic Anemia see Anemia
- Appendicitis
- Arteriosclerosis
- Arteritis see Temporal Arteritis
- Arthritis
- Arthritis, Juvenile Rheumatoid see Stills Disease
- Asbestosis
- Aspergers Syndrome
- Asthma
- Atherosclerosis
- Athletes Foot
- Athletic Injuries see Sports Injuries
- Atopic Dermatitis
- Attention Deficit Disorder see ADHD
- Autism
- Autoimmune Diseases
- Avian Influenza see Bird Flu