See Conditions by First Letter (A)
- Abdomen, Acute
- Abdominal Abscess
- Abdominal Aortic Aneurysm
- Abdominal Injuries
- Abdominal Neoplasms
- Abdominal Obesity Metabolic Syndrome
- Abdominal Pain
- Aberrant Crypt Foci
- Abetalipoproteinemia
- Abnormalities, Drug-Induced
- Abnormalities, Multiple
- Abnormalities, Radiation-Induced
- Abortion, Habitual
- Abortion, Incomplete
- Abortion, Missed
- Abortion, Septic
- Abortion, Spontaneous
- Abortion, Threatened
- Abrikosov's Tumor
- Abruptio Placentae
- Abscess
- Absent T Lymphocytes
- Acalculous Cholecystitis
- Acanthocheilonemiasis
- Acanthocytosis
- Acanthosis Nigricans
- Accelerated Idioventricular Rhythm
- Achalasia
- Achlorhydria
- Achondroplasia
- Acid-Base Imbalance
- Acidosis
- Acidosis, Lactic
- Acidosis, Renal Tubular
- Acidosis, Respiratory
- Acinetobacter Infections
- Acinic Cell Carcinoma
- Acne Keloid
- Acne Vulgaris
- Acoustic Neuroma
- Acquired Fructose Intolerance
- Acquired Hemophilia
- Acquired Hyperostosis Syndrome
- Acquired Immunodeficiency Syndrome
- Acquired Von Willebrand Syndrome
- Acral Lentiginous Melanoma
- Acromegaly
- ACTH Syndrome, Ectopic
- ACTH-Secreting Pituitary Adenoma
- Actinic Cheilitis
- Acute Articular Rheumatism
- Acute Biphenotypic Leukemia
- Acute Chest Syndrome
- Acute Coronary Syndrome
- Acute Disease
- Acute Disseminated Encephalomyelitis
- Acute Erythroblastic Leukemia
- Acute Erythroid Leukemia
- Acute Graft Versus Host Disease
- Acute Intermittent Porphyria
- Acute Kidney Injury
- Acute Lung Injury
- Acute Lymphoblastic Leukemia
- Acute Lymphoblastic Leukemia, Childhood
- Acute Megakaryoblastic Leukemia
- Acute Monoblastic Leukemia
- Acute Mountain Sickness
- Acute Myeloblastic Leukemia With Maturation
- Acute Myeloblastic Leukemia Without Maturation
- Acute Myelocytic Leukemia
- Acute Myeloid Leukemia, Adult
- Acute Myeloid Leukemia, Childhood
- Acute Myelomonocytic Leukemia
- Acute Non Lymphoblastic Leukemia
- Acute Promyelocytic Leukemia
- Acute Radiation Syndrome
- Acute Respiratory Distress Syndrome
- Acute-Phase Reaction
- Adamantinoma
- Adams-Stokes Syndrome
- Addison Disease
- Adenine Phosphoribosyltransferase Deficiency
- Adenocarcinoma
- Adenocarcinoma of Lung
- Adenocarcinoma of the Appendix
- Adenocarcinoma, Bronchiolo-Alveolar
- Adenocarcinoma, Clear Cell
- Adenocarcinoma, Follicular
- Adenocarcinoma, Mucinous
- Adenocarcinoma, Papillary
- Adenocarcinoma, Scirrhous
- Adenocarcinoma, Sebaceous
- Adenoid Cystic Carcinoma
- Adenoma
- Adenoma of the Adrenal Gland
- Adenoma, Acidophil
- Adenoma, Basophil
- Adenoma, Chromophobe
- Adenoma, Islet Cell
- Adenoma, Liver Cell
- Adenoma, Pleomorphic
- Adenoma, Villous
- Adenomatous Polyposis Coli
- Adenomatous Polyps
- Adenomyoepithelioma
- Adenomyosis
- Adenosine Deaminase Deficiency
- Adenoviridae Infections
- Adenovirus Infections, Human
- Adjustment Disorders
- Adnexal Diseases
- Adrenal Cancer
- Adrenal Cortex Diseases
- Adrenal Cortex Neoplasms
- Adrenal Gland Diseases
- Adrenal Gland Neoplasms
- Adrenal Hyperplasia, Congenital
- Adrenal Insufficiency
- Adrenocortical Adenoma
- Adrenocortical Carcinoma
- Adrenocortical Hyperfunction
- Adrenogenital Syndrome
- Adrenoleukodystrophy
- Adrenoleukodystrophy X-linked
- Adrenomyeloneuropathy
- Adult Neuronal Ceroid Lipofuscinosis
- Affective Disorders, Psychotic
- Affective Symptoms
- Afibrinogenemia
- Agammaglobulinemia
- Ageusia
- Aggression
- Aggressive NK Cell Leukemia
- Aggressive Periodontitis
- Aging, Premature
- Agnosia
- Agoraphobia
- Agranulocytosis
- Agraphia
- Aicardi Syndrome
- AIDS Dementia Complex
- AIDS-Associated Nephropathy
- AIDS-Related Complex
- AIDS-Related Opportunistic Infections
- Airway Obstruction
- Airway Remodeling
- Akathisia, Drug-Induced
- AL Amyloidosis
- Alagille Syndrome
- Albinism
- Albinism, Ocular
- Albinism, Oculocutaneous
- Albright's Hereditary Osteodystrophy
- Albuminuria
- Alcohol Amnestic Disorder
- Alcohol Drinking
- Alcohol Withdrawal Delirium
- Alcohol Withdrawal Seizures
- Alcohol-Induced Disorders
- Alcohol-Related Disorders
- Alcoholic Intoxication
- Alcoholic Neuropathy
- Alcoholism
- Alkalosis
- Alkalosis, Respiratory
- Alkaptonuria
- Allergic Bronchopulmonary Aspergillosis
- Alopecia
- Alopecia Areata
- Alpha 1-Antitrypsin Deficiency
- Alpha-Mannosidosis
- Alpha-Thalassemia
- Alphavirus Infections
- Alport Syndrome
- Alstrom Syndrome
- Alternating Hemiplegia of Childhood
- Altitude Sickness
- Alveolar Bone Loss
- Alveolar Echinococcosis
- Alveolar Soft Part Sarcoma
- Alveolitis, Extrinsic Allergic
- Alzheimer Disease
- Alzheimer Disease Familial
- Alzheimer Disease Type 2
- Amaurosis Fugax
- Amblyopia
- Amebiasis
- Amelogenesis Imperfecta
- Amenorrhea
- Amino Acid Metabolism, Inborn Errors
- Amnesia
- Amphetamine-Related Disorders
- Amputation, Traumatic
- Amyloid Neuropathies
- Amyloid Neuropathies, Familial
- Amyloidosis
- Amyloidosis AA
- Amyloidosis Cerebral
- Amyloidosis, Familial
- Amyotrophic Lateral Sclerosis
- Anal Cancer
- Anaphylaxis
- Anaplasmosis
- Anaplastic Astrocytoma
- Anaplastic Ependymoma
- Anaplastic Large Cell Lymphoma
- Anaplastic Oligoastrocytoma
- Anaplastic Oligodendroglioma
- Anaplastic Plasmacytoma
- Anastomotic Leak
- Ancylostomiasis
- Andersen Syndrome
- Andersen-Tawil Syndrome
- Anemia
- Anemia, Aplastic
- Anemia, Diamond-Blackfan
- Anemia, Dyserythropoietic, Congenital
- Anemia, Hemolytic
- Anemia, Hemolytic, Autoimmune
- Anemia, Hemolytic, Congenital
- Anemia, Hemolytic, Congenital Nonspherocytic
- Anemia, Hypochromic
- Anemia, Hypoplastic, Congenital
- Anemia, Iron-Deficiency
- Anemia, Neonatal
- Anemia, Refractory
- Anemia, Refractory, with Excess of Blasts
- Anemia, Sickle Cell
- Anemia, Sideroblastic
- Anencephaly
- Aneuploidy
- Aneurysm
- Aneurysm, Dissecting
- Aneurysm, Ruptured
- Angelman Syndrome
- Angina Pectoris
- Angina Pectoris, Variant
- Angina, Unstable
- Angiodysplasia
- Angioedema
- Angioedemas, Hereditary
- Angiofibroma
- Angiofollicular Lymph Hyperplasia
- Angioid Streaks
- Angioimmunoblastic Lymphadenopathy With Dysproteinemia
- Angiolipoma
- Angiomatosis
- Angiomatous Lymphoid Hamartoma
- Angiomyolipoma
- Aniridia
- Anisometropia
- Ankle Injuries
- Ankylosis
- Anodontia
- Anomia
- Anophthalmos
- Anorectal Atresia
- Anorexia
- Anorexia Nervosa
- Anovulation
- Anoxia
- Anterior Compartment Syndrome
- Anterior Uveitis
- Anterior Wall Myocardial Infarction
- Anthrax
- Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis
- Antiphospholipid Syndrome
- Antisocial Personality Disorder
- Antisynthetase Syndrome
- Antithrombin III Deficiency
- Anuria
- Anus Diseases
- Anus Neoplasms
- Anus, Imperforate
- Anxiety Disorders
- Anxiety, Separation
- Aortic Aneurysm
- Aortic Aneurysm, Abdominal
- Aortic Aneurysm, Thoracic
- Aortic Arch Syndromes
- Aortic Coarctation
- Aortic Diseases
- Aortic Rupture
- Aortic Valve Insufficiency
- Aortic Valve Stenosis
- Aphakia
- Aphasia
- Aphasia, Broca
- Aphasia, Primary Progressive
- Aphthous Stomatitis
- Aplasia Cutis Congenita
- Aplastic Anemia
- Apnea
- Apparent Mineralocorticoid Excess
- Appendiceal Neoplasms
- Appendicitis
- Apraxia, Ideomotor
- Apraxias
- Arachnidism
- Arachnodactyly
- Arachnoiditis
- Arbovirus Infections
- Arginase Deficiency
- Argininosuccinic Aciduria
- Arm Injuries
- Arnold-Chiari Malformation
- Aromatic Amino Acid Decarboxylase Deficiency
- Arrhythmia, Sinus
- Arrhythmias, Cardiac
- Arrhythmogenic Right Ventricular Dysplasia
- Arsenic Poisoning
- Arterial Calcification Due to CD73 Deficiency
- Arterial Occlusive Diseases
- Arteriosclerosis
- Arteriosclerosis Obliterans
- Arteriovenous Fistula
- Arteriovenous Malformations
- Arteritis
- Arthralgia
- Arthritis
- Arthritis, Experimental
- Arthritis, Gouty
- Arthritis, Infectious
- Arthritis, Juvenile Rheumatoid
- Arthritis, Psoriatic
- Arthritis, Reactive
- Arthritis, Rheumatoid
- Arthrogryposis
- Arthrogryposis Multiplex Congenita
- Arthropathy, Neurogenic
- Articulation Disorders
- Asbestosis
- Ascariasis
- Ascaridiasis
- Ascites
- Ascorbic Acid Deficiency
- Asherman's Syndrome
- Aspartylglucosaminuria
- Aspartylglycosaminuria
- Asperger Syndrome
- Aspergillosis
- Aspergillosis, Allergic Bronchopulmonary
- Asphyxia
- Asphyxia Neonatorum
- Asthenia
- Asthenopia
- Asthenozoospermia
- Asthma
- Asthma, Aspirin-Induced
- Asthma, Exercise-Induced
- Astigmatism
- Astrocytoma
- Asymptomatic Infections
- Ataxia
- Ataxia Telangiectasia
- Atherosclerosis
- Athletic Injuries
- Atrial Fibrillation
- Atrial Flutter
- Atrial Myxoma, Familial
- Atrial Premature Complexes
- Atrioventricular Block
- Atrioventricular Septal Defect
- Atrophy
- Attention Deficit and Disruptive Behavior Disorders
- Attention Deficit Disorder with Hyperactivity
- Attenuated Familial Adenomatous Polyposis
- Atypical Hemolytic Uremic Syndrome
- Auditory Diseases, Central
- Auditory Neuropathy
- Auditory Perceptual Disorders
- Autistic Disorder
- Autoimmune Diseases
- Autoimmune Diseases of the Nervous System
- Autoimmune Enteropathy
- Autoimmune Hemolytic Anemia
- Autoimmune Hepatitis
- Autoimmune Inner Ear Disease
- Autoimmune Lymphoproliferative Syndrome
- Autoimmune Pancreatitis
- Autonomic Dysreflexia
- Autonomic Nervous System Diseases
- Autosomal Dominant Partial Epilepsy With Auditory Features
- Autosomal Recessive Hyper IgE Syndrome
- Autosomal Recessive Polycystic Kidney Disease
- Avitaminosis
- Azoospermia
- Azotemia