Conditions beginning with the letter "A"
 | Abnormal Heart Rhythms (Arrhythmias, Dysrhythmia) |
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| Abrasions (Cuts and Scrapes, Wound Care) |
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| Acne (Pimples, Zits) |
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| Acne Rosacea (Rosacea) |
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| Actinic Keratosis (Precancerous Skin Lesion, Solar Keratosis) |
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| Acute Exacerbations of Chronic Bronchitis (AECB) |
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| ADD (Attention Deficit Hyperactivity Disorder, ADHD, Attention Deficit Disorder) |
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| Addiction (Substance Use Problems, Drug Abuse) |
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| Addison's Anemia (Pernicious Anemia, Vitamin B12 Deficiency, Congenital Pernicious Anemia, Combined Systems Disease) |
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| Addison's Disease (Adrenal Insufficiency, Hypocortisolism, Primary Adrenal Insufficiency) |
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| ADHD (Attention Deficit Hyperactivity Disorder, Attention Deficit Disorder, ADD) |
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| Adolescent Suicide (Teen Suicide) |
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| Adrenal Insufficiency (Addison's Disease, Hypocortisolism, Primary Adrenal Insufficiency) |
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| AECB (Acute Exacerbations of Chronic Bronchitis) |
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| Agoraphobia (Social Phobia) |
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| AIDS (HIV/AIDS, Human Immunodeficiency Virus) |
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| Alcohol Abuse (Alcohol Use, Alcoholism, Alcohol Dependence) |
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| Alcohol Dependence (Alcohol Use, Alcoholism, Alcohol Abuse) |
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| Alcohol Use (Alcoholism, Alcohol Abuse, Alcohol Dependence) |
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| Alcoholism (Alcohol Use, Alcohol Abuse, Alcohol Dependence) |
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| Allergic Rhinitis (Allergies, Hay Fever, Pollinosis) |
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| Allergies (Allergic Rhinitis, Hay Fever, Pollinosis) |
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| Alopecia (Hair Loss, Baldness) |
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| ALS (Lou Gehrig's Disease, Amyotrophic Lateral Sclerosis) |
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| Altitude Sickness (High Altitude Sickness, Mountain Sickness) |
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| Alzheimer's Disease (Senility, Senile Dementia) |
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| Amyotrophic Lateral Sclerosis (ALS, Lou Gehrig's Disease) |
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| Anaphylaxis |
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| Andropause (Low Testosterone, Male Menopause, Manopause, Testosterone Deficiency) |
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| Anemia |
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| Anemia of Chronic Disease (Anemia of Inflammation, Iron Reutilization Anemia) |
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| Anemia of Inflammation (Anemia of Chronic Disease, Iron Reutilization Anemia) |
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| Aneurysm (Brain Aneurysm, Aortic Aneurysm) |
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| Angina (Angina Pectoris) |
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| Angina Pectoris (Angina) |
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| Angioplasty (Heart Artery Dilation, PCTA, PCI, Balloon Angioplasty) |
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| Ankylosing Spondylitis |
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| Anorexia (Eating Disorders, Bulimia) |
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| Anthrax (Bacillus anthracis Infection, Cutaneous Anthrax, Inhalation Anthrax, Intestinal Anthrax) |
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| Anxiety Disorders |
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| Aortic Aneurysm (Aneurysm, Brain Aneurysm) |
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| Aphthous Ulcers (Canker Sores, Mouth Ulcers) |
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| Aplastic Anemia (Aregenerative Anemia, Panmyelopathy, Hypoplastic Anemia, Toxic Paralytic Anemia) |
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| Appendicitis |
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| Arachnodactyly (Marfan's Syndrome) |
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| Aregenerative Anemia (Aplastic Anemia, Panmyelopathy, Hypoplastic Anemia, Toxic Paralytic Anemia) |
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| Arrhythmias (Abnormal Heart Rhythms, Dysrhythmia) |
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| Arthritis |
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| Asbestosis |
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| Asthma |
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| Astigmatism |
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| Athlete's Foot (Tinea Pedis, Foot Ringworm) |
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| Athletic Injuries (Sports Injuries) |
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| Atrial Fibrillation |
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| Attention Deficit Disorder (Attention Deficit Hyperactivity Disorder, ADHD, ADD) |
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| Attention Deficit Hyperactivity Disorder (ADHD, Attention Deficit Disorder, ADD) |
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| Atypical Pneumonia (SARS, Severe Acute Respiratory Syndrome) |
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| Autism |
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| Avian Influenza (Bird Flu, Flu, Avian, Influenza, Bird) |
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