- Abdominal Pain
- Alcohol Abuse and Alcoholism
- Alopecia (hair loss)
- Anxiety
- Appendicitis
- Autism
- Acquired Immuno Deficiency Syndrome
- Alzheimer's Disease
- Anaemia
- Arthritis
- Asthma
- Anthrax
- Amoebiasis
- Atherosclerosis
- Adult Inclusion Conjunctivitis
- Atopic Keratoconjunctivitis
- Avian influenza in humans
- Astigmatism
- Aphakia
- Anisometropia
- Aniseikonia
- Asbestos-related diseases
- Amblyopia
- Ankyloblepharon
- Abnormal uterine bleeding
- Acquired Capillary Haemangioma of Eyelid
- Anaemia during pregnancy (Maternal anemia)