Acute Coronary Syndromes Acute Cholecystitis Alzheimer's Disease Abdominal Aortic Aneurysmectomy and Bypass Abdominal Aortic Angiogram Achilles Tendon Injury Acne Acne Rosacea Adhesions Agoraphobia Air Contrast Barium Enema Allergic Conjunctivitis Amyotrophic Lateral Sclerosis (ALS) Altitude Sickness Amenorrhea: Missed Menstrual Periods Anaerobic Pneumonia Anal Fissure Anal Fistula Ability test Abrasion Academic skills disorders Acanthamoeba infection Acne Acne, infant Achievement Test Adenoid disorders Adenovirus Adjustment disorder Adolescent immunization Adoption Adoption Resource Exchange for Single Parents, Inc. (ARESP) AIDS Air bags Al-Anon/Alateen Albinism Alexander Graham Bell Association for the Deaf Allergic rhinitis Allergies Alport’s syndrome AMBER Alert Plan American Academy of Child and Adolescent Psychiatry (AACAP) American Academy of Pediatrics (AAP) American Association on Mental Retardation (AAMR) American Cleft Palate-Craniofacial Association (ACPA) American Diabetes Association American Juvenile Arthritis Organization (AJAO) American Lyme Disease Foundation (ALDF) American SIDS Institute American Sleep Apnea Association (ASAA) American Speech-Language-Hearing Association (ASHA) Americans with Disabilities Act (ADA) Anaphylaxis Anencephaly Angelman syndrome Angelman Syndrome Foundation Angioedema Anorexia nervosa Anthrax Anxiety Anxiety disorders Apgar score Aplasia cutis Apnea Appendicitis Arboviral infections Arthritis Arthritis Foundation Asperger syndrome (Asperger’s disorder) Asperger Syndrome Coalition of the United States Aspergillosis Association for the Education and Rehabilitation of the Blind and Visually Impaired Association of Birth Defect Children, Inc. Asthma Asthma and Allergy Foundation of America Athlete’s foot Attention deficit hyperactivity disorder (ADHD) Attention Deficit Information Network, Inc. Autism Autism Society of America Autism Society of America Foundation (ASAF) Aveeno bath Animal Bites Adoption Aarskog Syndrome Acid-Base Balance Acidosis Alkalosis Acute Intermittent Porphyria Acquired Immunity Ataxia-Telangiectasia Allergic Reactions Anaphylactic Reactions Autoimmune Disorders Apnea of Prematurity Anemia Abdominal Wall Defects (Omphalocele and Gastroschisis) Attention Deficit/Hyperactivity Disorder (ADD, ADHD) Asthma Appendicitis Amblyopia Amino Acid Metabolism Autism Asperger's Disorder and Pervasive Developmental Disorder Not Otherwise Specified Asthma Acne Age-related macular degeneration Alcohol Alzheimer's and dementia Amnesia Anaemia Anaphylactic shock Ankylosing spondylitis Anthrax Anti-coagulants Anxiety disorder Arsenic poisoning Arthritis Asbestos disease Asperger's syndrome Autism Aarskog Syndrome Aase Syndrome Abetalipoproteinemia Ablepharon Macrostomia Syndrome Acanthocheilonemiasis Acanthocytosis Acanthosis Nigricans Achalasia Achard Thiers Syndrome Achondrogenesis Achondroplasia Acidemia, Isovaleric Acidemia, Methylmalonic Acidemia, Propionic Acne Rosacea Acoustic Neuroma Acquired Aplastic Anemia Acrocallosal Syndrome, Schinzel Type Acrodermatitis Enteropathica Acrodysostosis Acromegaly Acromesomelic Dysplasia Acromicric Dysplasia ACTH Deficiency Acute Respiratory Distress Syndrome Adams Oliver Syndrome Addison's Disease Adenoid Cystic Carcinoma Adenylosuccinate Lyase Deficiency Adie Syndrome Adrenal Hyperplasia, Congenital (General) Adrenoleukodystrophy Adult Onset Still?s Disease Adult Panic Anxiety Syndrome Afibrinogenemia, Congenital Agenesis of Corpus Callosum Agnosia, Primary Visual Agranulocytosis, Acquired Ahumada-Del Castillo Syndrome Aicardi Syndrome AIDS (Acquired Immune Deficiency Syndrome) AIDS Dysmorphic Syndrome Alagille Syndrome Albinism, ocular Albinism, oculocutaneous Alexander Disease Alkaptonuria Allan Herndon Syndrome Alopecia Areata Alpers Disease Alpha-1-Antitrypsin Deficiency Alpha-Mannosidosis Alpha Thalassemia X-linked Mental Retardation Syndrome Alport Syndrome Alstrom Syndrome Alternating Hemiplegia of Childhood Alveolar Capillary Dysplasia Alveolar Soft Part Sarcoma Alveolitis, Extrinsic Allergic Alzheimer's Disease Ameloblastic Carcinoma Ameloblastoma Amelogenesis Imperfecta Amenorrhea, Primary Amniotic Band Syndrome Amyloidosis Amyotrophic Lateral Sclerosis Anaphylaxis Andersen Disease (GSD IV) Androgen Insensitivity Syndrome, Partial Anemia of Chronic Disease Anemia, Blackfan Diamond Anemia, Fanconi Anemia, Hemolytic, Acquired Autoimmune Anemia, Hemolytic, Cold Antibody Anemia, Hemolytic, Warm Antibody Anemia, Hereditary Nonspherocytic Hemolytic Anemia, Hereditary Spherocytic Hemolytic Anemia, Megaloblastic Anemia, Pernicious Anemias, Sideroblastic Anencephaly Angelman Syndrome Angioedema, Hereditary Aniridia Cerebellar Ataxia Mental Deficiency Aniridia Ankylosing Spondylitis Anodontia Anorexia Nervosa Anthrax Antiphospholipid Syndrome Antisocial Personality Disorder Antithrombin Deficiency Antley Bixler Syndrome Apert Syndrome Aplasia Cutis Congenita Apnea, Infantile Apnea, Sleep Apraxia APS Type-1 Arachnoid Cysts Arachnoiditis Arginase Deficiency Argininosuccinic Aciduria Arnold-Chiari Malformation Arteriovenous Malformation Arteritis, Giant Cell Arteritis, Takayasu Arthritis, Infectious Arthritis, Juvenile Rheumatoid Arthritis, Psoriatic Arthrogryposis Multiplex Congenita Asherman's Syndrome Asherson's Syndrome Aspartylglycosaminuria Asperger's Syndrome Aspergillosis Astrocytoma, Malignant Astrocytoma Ataxia Telangiectasia Ataxia with Vitamin E Deficiency Ataxia, Friedreich's Ataxia, Hereditary, Autosomal Dominant Atrial Septal Defects Atrioventricular Septal Defect Attention Deficit Hyperactivity Disorder Atypical Hemolytic Uremic Syndrome Atypical Mole Syndrome Autism Autoimmune Blistering Diseases Autoimmune Polyendocrine Syndrome Type II Autoimmune Thyroiditis