- Alcoholism
- Alkaline phosphatase
- Alkalna fosfataza
- Allergies
- Alzheimer’s Disease
- Amnesia
- Amyloidosis
- Amyotrophic lateral sclerosis
- Anal cancer
- Anal Fissure
- Anal Itching
- Anaphylaxis
- Anemia
- Angina Pectoris
- Anhidrosis
- Ankylosing spondylitis
- Anorexia nervosa
- Antibiotic-associated diarrhea
- Antiphospholipid syndrome
- Anxiety
