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• Abscess, Bartholin (See: Bartholin cyst)
• Absence seizure
• Acanthosis nigricans
• Achilles tendinitis
• Achilles tendon rupture
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• Acid reflux (See: GERD)
• Acid reflux, infant (See: Infant acid reflux)
• ACL injury
• Acne
• Acoustic neuroma
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• Acquired immunodeficiency syndrome (See: HIV/AIDS)
• Acromegaly
• Actinic keratosis
• Acute coronary syndrome
• Acute febrile neutrophilic dermatosis (See: Sweet syndrome)
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• Acute kidney failure (See: Kidney failure, acute)
• Acute liver failure
• Acute lymphocytic leukemia
• Acute myelogenous leukemia (See: Acute myelogenous leukemia (AML))
• Acute myelogenous leukemia (AML)
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• Acute radiation sickness (See: Radiation sickness)
• Acute radiation syndrome (See: Radiation sickness)
• Acute respiratory distress syndrome (See: ARDS)
• Acute sinusitis
• Addiction, alcohol (See: Alcoholism)
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• Addiction, drug (See: Drug addiction)
• Addiction, gambling (See: Compulsive gambling)
• Addiction, nicotine (See: Nicotine dependence)
• Addison's disease
• Adenitis, mesenteric (See: Mesenteric lymphadenitis)
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• Adenomyosis
• ADHD in children
• ADHD, Adult (See: Adult ADHD)
• ADHD, in children (See: ADHD in children)
• Adhesive capsulitis (See: Frozen shoulder)
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• Adjustment disorders
• Adolescent schizophrenia (See: Childhood schizophrenia)
• Adrenal gland tumor (See: Pheochromocytoma)
• Adrenal insufficiency (See: Addison's disease)
• Adult ADHD
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• Adult ADHD (attention-deficit/hyperactivity disorder) (See: Adult ADHD)
• Adult Still's disease
• Age spots (See: Age spots (liver spots))
• Age spots (liver spots)
• Age-related hearing loss (See: Hearing loss)
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• Agnogenic myeloid metaplasia (See: Myelofibrosis)
• Agoraphobia
• AIDS/HIV (See: HIV/AIDS)
• Airplane ear
• Albinism
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• Alcohol addiction (See: Alcoholism)
• Alcohol poisoning
• Alcohol-related birth defects (See: Fetal alcohol syndrome)
• Alcohol-related neurodevelopmental disorder (See: Fetal alcohol syndrome)
• Alcoholic hepatitis
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• Alcoholism
• Aldosteronoma (See: Primary aldosteronism)
• Allergic angiitis (See: Churg-Strauss syndrome)
• Allergic granulomatosis (See: Churg-Strauss syndrome)
• Allergic reaction (See: Allergies)
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• Allergic rhinitis (See: Hay fever)
• Allergies
• Allergy (See: Allergies)
• Allergy, dust mite (See: Dust mite allergy)
• Allergy, egg (See: Egg allergy)
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• Allergy, food (See: Food allergy)
• Allergy, latex (See: Latex allergy)
• Allergy, milk (See: Milk allergy)
• Allergy, mold (See: Mold allergy)
• Allergy, nickel (See: Nickel allergy)
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• Allergy, peanut (See: Peanut allergy)
• Allergy, penicillin (See: Penicillin allergy)
• Allergy, pet (See: Pet allergy)
• Allergy, semen
• Allergy, shellfish (See: Shellfish allergy)
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• Allergy, soy (See: Soy allergy)
• Allergy, sulfa
• Allergy, sun
• Allergy, wheat (See: Wheat allergy)
• Alopecia (See: Hair loss)
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• ALS (See: Amyotrophic lateral sclerosis)
• Alveolar osteitis (See: Dry socket)
• Alzheimer's disease
• Ambiguous genitalia
• Amblyopia (See: Lazy eye (amblyopia))
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• Amenorrhea
• American trypanosomiasis (See: Chagas disease)
• Amnesia
• Amnesia, dissociative (See: Dissociative disorders)
• Amnesia, transient global (See: Transient global amnesia)
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• Amnestic syndrome (See: Amnesia)
• Amyloidosis
• Amyotrophic lateral sclerosis
• ANA test
• Anal cancer
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• Anal fissure
• Anal itching
• Anaphylaxis
• Anaplasmosis (See: Ehrlichiosis)
• Anemia
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• Anemia, aplastic (See: Aplastic anemia)
• Anemia, Cooley's (See: Thalassemia)
• Anemia, iron deficiency (See: Iron deficiency anemia)
• Anemia, Mediterranean (See: Thalassemia)
• Anemia, sickle cell (See: Sickle cell anemia)
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• Anemia, vitamin deficiency (See: Vitamin deficiency anemia)
• Aneurysm, aortic (See: Aortic aneurysm)
• Aneurysm, brain (See: Brain aneurysm)
• Aneurysm, cerebral (See: Brain aneurysm)
• Angelman syndrome
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• Angiitis (See: Vasculitis)
• Angiitis, allergic (See: Churg-Strauss syndrome)
• Angina
• Angina pectoris (See: Angina)
• Angioedema and hives (See: Hives and angioedema)
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• Angiofollicular lymph node hyperplasia (See: Castleman disease)
• Angiogram
• Angioplasty, carotid
• Anhidrosis
• Ankle fracture (See: Broken ankle/broken foot)
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• Ankle sprain (See: Sprained ankle)
• Ankylosing spondylitis
• Anorexia nervosa
• Anorgasmia
• Anterior cruciate ligament injury (See: ACL injury)
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• Anthrax
• Antibiotic-associated colitis (See: Pseudomembranous colitis)
• Antibiotic-associated diarrhea
• Antiphospholipid syndrome
• Antisocial personality disorder
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• Anxiety disorder, generalized (See: Generalized anxiety disorder)
• Anxiety disorder, social (See: Social anxiety disorder (social phobia))
• Aortic aneurysm
• Aortic calcification
• Aortic coarctation (See: Coarctation of the aorta)
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• Aortic dissection
• Aortic valve regurgitation
• Aortic valve stenosis
• Aphasia
• Aphasia, primary progressive (See: Primary progressive aphasia)
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• Aphthous ulcer (See: Canker sore)
• Apical ballooning syndrome (See: Broken heart syndrome)
• Aplastic anemia
• Apnea, sleep (See: Sleep apnea)
• Apnea, sleep (central) (See: Sleep apnea, central)
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• Apnea, sleep (obstructive) (See: Sleep apnea, obstructive)
• Appendicitis
• ARDS
• Arenaviruses (See: Viral hemorrhagic fevers)
• Argentine hemorrhagic fever (See: Viral hemorrhagic fevers)
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• Arm fracture (See: Broken arm)
• Arrhythmia (See: Heart arrhythmias)
• Arteriosclerosis / atherosclerosis
• Arteriosclerosis/atherosclerosis (See: Arteriosclerosis / atherosclerosis)
• Arteriovenous fistula
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• Arteriovenous malformation (See: Brain AVM (arteriovenous malformation))
• Arteritis, giant cell (See: Giant cell arteritis)
• Arteritis, Takayasu's (See: Takayasu's arteritis)
• Arthritis
• Arthritis, basal joint (See: Thumb arthritis)
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• Arthritis, gouty (See: Gout)
• Arthritis, infectious (See: Septic arthritis)
• Arthritis, juvenile rheumatoid (See: Juvenile rheumatoid arthritis)
• Arthritis, osteoarthritis (See: Osteoarthritis)
• Arthritis, psoriatic (See: Psoriatic arthritis)
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• Arthritis, reactive (See: Reactive arthritis)
• Arthritis, rheumatoid (See: Rheumatoid arthritis)
• Arthritis, septic (See: Septic arthritis)
• Arthritis, thumb (See: Thumb arthritis)
• Asbestosis
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• Ascariasis
• ASD (See: Atrial septal defect)
• Asperger's syndrome
• Aspergillosis
• Asthma
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• Asthma attack
• Asthma, childhood (See: Childhood asthma)
• Asthma, exercise-induced (See: Exercise-induced asthma)
• Asthma, occupational (See: Occupational asthma)
• Astigmatism
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• Ataxia
• Atelectasis (collapsed lung)
• Atherosclerosis (See: Arteriosclerosis / atherosclerosis)
• Athlete's foot
• Atopic dermatitis (eczema)
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• Atrial fibrillation
• Atrial septal defect
• Atrioventricular canal defect
• Atrioventricular septal defect (See: Atrioventricular canal defect)
• Atrophic vaginitis (See: Vaginal atrophy)
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• Attachment disorder (See: Reactive attachment disorder)
• Attention-deficit/hyperactivity disorder (ADHD) in children (See: ADHD in children)
• Atypical hyperplasia of the breast
• Autism
• Autoimmune hepatitis
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• Autonomic neuropathy
• Avascular necrosis
• Avian influenza (See: Bird flu (avian influenza))
• Avoidant personality disorder (See: Personality disorders)
• Avulsion fracture
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