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Abdominal aortic aneurysm

Absence seizure

Acanthosis nigricans

Achilles tendinitis

Achilles tendon rupture

Acoustic neuroma

Actinic keratosis

Acute coronary syndrome

Acute flaccid myelitis (AFM)

Acute kidney failure

Acute liver failure

Acute lymphocytic leukemia

Acute myelogenous leukemia

Acute sinusitis

Addison’s disease

Adjustment disorders

Adrenoleukodystrophy

Adult attention-deficit/hyperactivity disorder (ADHD)

Adult Still’s disease

Age spots (liver spots)

Alcohol intolerance

Alcohol poisoning

Alcohol use disorder

Alcoholic hepatitis

Alpha-gal syndrome

Alzheimer’s disease

Ambiguous genitalia

Ampullary cancer

Amyotrophic lateral sclerosis (ALS)

Angelman syndrome

Ankylosing spondylitis

Anorexia nervosa

Anorgasmia in women

Anterior vaginal prolapse (cystocele)

Antibiotic-associated diarrhea

Antiphospholipid syndrome

Antisocial personality disorder

Anxiety disorders

Aortic dissection

Aortic valve disease

Aortic valve regurgitation

Aortic valve stenosis

Aplastic anemia

Arteriosclerosis / atherosclerosis

Arteriovenous fistula

Arteriovenous malformation

Athlete’s foot

Atopic dermatitis (eczema)

Atrial fibrillation

Atrial septal defect (ASD)

Atrial tachycardia

Atrioventricular canal defect

Atrioventricular nodal reentry tachycardia (AVNRT)

Attention-deficit/hyperactivity disorder (ADHD) in children

Atypical hyperplasia of the breast

Autism spectrum disorder

Autoimmune hepatitis

Autoimmune pancreatitis

Autonomic neuropathy

Avascular necrosis (osteonecrosis)