- Abdominal Aortic Aneurysm
- Absence Seizure
- Acanthosis Nigricans
- Achalasia
- Achilles Tendinitis
- Achilles Tendon Rupture
- Acid Reflux Disease
- ACL Injury
- Acne
- Acoustic Neuroma
- Acquired Immuno Deficiency Syndrome
- Acromegaly
- Actinic Keratosis
- Acute Coronary Syndrome
- Acute Kidney Failure
- Acute Liver Failure
- Acute Lymphocytic Leukemia
- Acute Sinusitis
- Addison's Disease
- Adenoiditis
- Adenomyosis
- ADHD In Children
- Adjustment Disorders
- Adrenal Cancer
- Adrenal Hyperplasia
- Adrenoleukodystrophy
- Adult ADHD (Attention-Deficit / Hyperactivity Disorder)
- Adult CHD
- Adult Still'S Disease
- Age Spots
- Agoraphobia
- Airplane Ear
- Albinism
- Alcohol Intolerance
- Alcohol Poisoning
- Alcohol Use Disorder
- Alcoholic Hepatitis
- Allergies
- ALS
- Alzheimer's Disease
- Ameloblastoma
- Amenorrhea
- AML
- Amnesia
- Amniotic Fluid Embolism
- Ampullary Cancer
- Amyloidosis
- Anal Abscess
- Anal Cancer
- Anal Fissure
- Anal Fistula
- Anal Itching
- Anaphylaxis
- Anemia
- Aneurysms
- Angelman Syndrome
- Angina
- Anhidrosis
- Ankylosing Spondylitis
- Anorexia Nervosa
- Anorgasmia In Women
- Anterior Prolapse
- Anthrax
- Antibiotic - Associated Diarrhea
- Antiphospholipid Syndrome
- Anxiety
- Aortic Aneurysm
- Aortic Dissection
- Aortic Valve Disease
- Aortic Valve Regurgitation
- Aortic Valve Stenosis
- Apert Syndrome
- Aphasia
- Aplastic Anemia
- Appendicitis
- Ards
- Arteriovenous Fistula
- Arteriovenous Malformation
- Arthralgia
- Arthritis
- Artiosclerosis
- Asbestosis
- Ascariasis
- ASPD
- Aspergillosis
- Asthma
- Asthma Attack
- Astigmatism
- Ataxia
- Atelectasis
- Athlete's Foot
- Atopic Dermatitis (Eczema)
- Atrial Fibrillation
- Atrial Flutter
- Atrial Septal Defect (ASD)
- Atypical Depression
- Atypical Hyperplasia
- Autism Spectrum Disorder
- Autoimmune Hepatitis
- Autoimmune Pancreatitis
- Autonomic Neuropathy
- Avascular Necrosis
- AVCD
- AVPD
