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- Aboriginal subsistence whaling
- Absolute poverty
- Acetaminophen poisoning
- Achlorhydria
- Acid rain
- Acidic precipitation
- Actinolite
- Acute hemolytic reaction
- Acute radiation syndrome
- Additives (Feingold diet)
- Adequate protein diet
- Adventure ecotourism
- AEH
- Aerobic oxygen
- Aeroponics
- Aflatoxins
- Agglutination
- Agricultural health
- Agro-toxins
- AHA
- AIDS
- Air pollution
- Air travel and cruise ship health
- Airplane ventilation
- Alcohol poisoning
- Aldrin
- Alkaline water
- Allergic (extrinsic) asthma
- Allergic reaction to chemotherapy
- Allergic reaction to drugs
- Allergic reaction to medication
- Allergic reaction to vaccines
- Allergies
- Alternative transportation
- Alternative veterinary medicine
- Aluminum recycling
- Aluminum toxicity
- Americans with Disabilities Act
- Amnesic shellfish poisoning
- Amosite
- Anaphylactic shock
- Anaphylaxis
- Angling
- Animal companionship
- Animal feeding operation
- Animal-assisted activities (AAA)
- Animal-assisted therapy (AAT)
- Animals in human therapy
- Annoyance reaction
- Anthophyllite
- Anthrax
- Antibiotic allergy
- Antibiotic-growth promoters
- Antioxidants
- Anti-personnel landmines
- Anti-seizure medication allergy
- Anti-vehicle mines
- Apgar Scale
- Apovitellenins VI
- Appetite stimulant
- Aquaculture
- Architectural Barriers Act
- Arcology
- Arsenic poisoning
- Arsenic trioxide
- Arsenicosis
- Arsenobetaine
- Arsenocholine
- Artisan fishing
- Asbestos removal
- Aspirin allergy
- Asthma
- Atropa belladonna
- Autoclave
- Azaspiracid shellfish poisoning