- A1C
- AAA see Aortic Aneurysm
- Abdominal Aortic Aneurysm see Aortic Aneurysm
- Abdominal Pain
- Abdominal Pregnancy see Ectopic Pregnancy
- Abnormalities see Birth Defects
- ABO Blood Groups see Blood
- Abortion
- About Your Medicines see Medicines; Over-the-Counter Medicines
- ABPA see Aspergillosis
- Abscess
- Abuse see Child Abuse; Elder Abuse; Intimate Partner Violence
- Accident Prevention see Safety
- Accidents see Falls; First Aid; Wounds and Injuries
- Achalasia see Esophagus Disorders
- Achilles Tendon Injuries see Heel Injuries and Disorders
- Achondroplasia see Dwarfism
- Acid Reflux see GERD; Heartburn
- ACL Injuries see Knee Injuries and Disorders
- Acne
- Acne Rosacea see Rosacea
- Acoustic Neuroma
- Acquired Immunodeficiency Syndrome see HIV
- Acromegaly see Growth Disorders; Pituitary Disorders
- Actinic Keratosis see Skin Cancer; Sun Exposure
- Acupuncture
- Acute Bronchitis
- Acute Flaccid Myelitis
- Acute Lymphoblastic Leukemia see Acute Lymphocytic Leukemia
- Acute Lymphocytic Leukemia
- Acute Myeloblastic Leukemia see Acute Myeloid Leukemia
- Acute Myeloid Leukemia
- Acute Pancreatitis see Pancreatitis
- Acute Respiratory Distress Syndrome see Respiratory Failure
- ADD see Attention Deficit Hyperactivity Disorder
- Addison Disease
- Adenoidectomy see Adenoids
- Adenoids
- Adenoma see Benign Tumors
- Adenomyosis see Endometriosis
- Adenovirus Infections see Viral Infections
- ADHD see Attention Deficit Hyperactivity Disorder
- Adhesions
- Adolescent Development see Teen Development
- Adolescent Health see Teen Health
- Adolescent Pregnancy see Teenage Pregnancy
- Adrenal Gland Cancer
- Adrenal Gland Disorders
- Adrenal Insufficiency see Addison Disease
- Adrenoleukodystrophy see Leukodystrophies
- Adult Immunization see Vaccines
- Advance Directives
- AF see Atrial Fibrillation
- Affordable Care Act see Health Insurance
- After Surgery
- Age-Related Macular Degeneration see Macular Degeneration
- Agent Orange see Veterans and Military Health
- Ageusia see Taste and Smell Disorders
- Aging see Older Adult Health
- Aging Skin see Skin Aging
- Agoraphobia see Phobias
- AIDS see HIV
- AIDS and Infections see HIV and Infections
- AIDS and Pregnancy see HIV and Pregnancy
- AIDS in Women see HIV in Women
- AIDS Medicines see HIV Medicines
- AIDS--Living With AIDS see Living with HIV
- Air Pollution
- Airsickness see Motion Sickness
- Alagille Syndrome see Liver Diseases
- Alaska Native Health see American Indian and Alaska Native Health
- Alcohol
- Alcohol Abuse see Alcohol Use Disorder (AUD)
- Alcohol Abuse in Pregnancy see Pregnancy and Substance Use
- Alcohol and Youth see Underage Drinking
- Alcohol Consumption see Alcohol
- Alcohol Dependence see Alcohol Use Disorder (AUD)
- Alcohol Use Disorder (AUD)
- Alcohol Use Disorder (AUD) Treatment
- Alcohol Withdrawal see Alcohol Use Disorder (AUD)
- Alcoholic Fatty Liver Disease see Fatty Liver Disease
- Alcoholism see Alcohol Use Disorder (AUD)
- ALL see Acute Lymphocytic Leukemia
- Allergic Bronchopulmonary Aspergillosis see Aspergillosis
- Allergic Rhinitis see Allergy; Hay Fever
- Allergy
- Allergy, Food see Food Allergy
- Allergy, Latex see Latex Allergy
- Alopecia see Hair Loss
- Alpha-1 Antitrypsin Deficiency
- Alpha-tocopherol see Vitamin E
- ALS see Amyotrophic Lateral Sclerosis
- Alternative Medicine see Complementary and Integrative Medicine
- Alternative Therapy for Cancer see Cancer Alternative Therapies
- Alzheimer's Caregivers
- Alzheimer's Disease
- Amblyopia
- AMD see Macular Degeneration
- Amenorrhea see Menstruation
- American Indian and Alaska Native Health
- American Indian Health see American Indian and Alaska Native Health
- Amino Acid Metabolism Disorders
- AML see Acute Myeloid Leukemia
- Amnesia see Memory
- Amniocentesis see Prenatal Testing
- Amphetamines see Club Drugs; Methamphetamine
- Amputation see Artificial Limbs; Limb Loss
- Amyloidosis
- Amyotrophic Lateral Sclerosis
- Anabolic Steroids
- Anal Cancer
- Anal Disorders
- Analgesics see Pain Relievers
- Anaphylaxis
- Anaplasmosis see Tick Bites
- Anatomy
- Anemia
- Anencephaly see Neural Tube Defects
- Anesthesia
- Aneurysms
- Angiitis see Vasculitis
- Angina
- Angioplasty
- Animal Bites
- Animal Diseases and Your Health
- Animal Health see Animal Diseases and Your Health; Pet Health
- Ankle Injuries and Disorders
- Ankylosing Spondylitis
- Annual Physical Examination see Health Checkup
- Anorexia Nervosa see Eating Disorders
- Anosmia see Taste and Smell Disorders
- Anterior Cruciate Ligament Injury see Knee Injuries and Disorders
- Anthrax
- Anti-platelet drugs see Blood Thinners
- Antibiotic Resistance
- Antibiotics
- Anticoagulants see Blood Thinners
- Antidepressants
- Antihypertensive Medicines see Blood Pressure Medicines
- Antimicrobial Resistance see Antibiotic Resistance
- Antioxidants
- Antisocial Personality Disorder see Personality Disorders
- Anxiety
- Aortic Aneurysm
- Aortic Dissection see Aortic Aneurysm
- Aortic Stenosis see Heart Valve Diseases
- Aphasia
- Aphthous Ulcers see Canker Sores
- Aplastic Anemia
- Apnea, Sleep see Sleep Apnea
- Appendicitis
- Arachnoiditis see Meningitis
- Arctic Health see American Indian and Alaska Native Health
- ARDS see Respiratory Failure
- Arm Injuries and Disorders
- Arnold-Chiari Malformation see Chiari Malformation
- Arrhythmia
- Arsenic
- Arteriosclerosis see Atherosclerosis
- Arteriosclerosis of Extremities see Peripheral Arterial Disease
- Arteriosclerosis, Coronary see Coronary Artery Disease
- Arteriovenous Malformations
- Arthritis
- Arthrography see Joint Disorders
- Arthroplasty see Hip Replacement; Joint Disorders; Knee Replacement
- Arthroscopy see Joint Disorders
- Artificial Feeding see Nutritional Support
- Artificial Insemination see Infertility
- Artificial Lens see Cataract; Refractive Errors
- Artificial Limbs
- Asbestos
- Asbestosis see Asbestos
- Ascorbic Acid see Vitamin C
- Aseptic Meningitis see Meningitis
- Aseptic Necrosis see Osteonecrosis
- Asian American Health
- Asperger Syndrome see Autism Spectrum Disorder
- Aspergillosis
- Assisted Breathing see Critical Care
- Assisted Living
- Assisted Reproductive Technology
- Assistive Devices
- Asthma
- Asthma in Children
- Astigmatism see Refractive Errors
- Ataxia see Cerebellar Disorders; Degenerative Nerve Diseases; Friedreich Ataxia; Movement Disorders
- Ataxia Telangiectasia
- Atelectasis see Collapsed Lung
- Atherosclerosis
- Atherosclerosis, Coronary see Coronary Artery Disease
- Athlete's Foot
- Atopic Dermatitis see Eczema
- Atrial Fibrillation
- Attention Deficit Hyperactivity Disorder
- Auditory Tumor see Acoustic Neuroma
- Autism see Autism Spectrum Disorder
- Autism Spectrum Disorder
- Autoimmune Diseases
- Autoinflammatory Disorders see Autoimmune Diseases
- Automated External Defibrillators see Sudden Cardiac Arrest
- Automobile Safety see Motor Vehicle Safety
- Autonomic Nervous System Disorders
- Avascular Necrosis see Osteonecrosis
- Avian Influenza see Bird Flu
- AVM see Arteriovenous Malformations
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