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Abnormal Heart Rhythms (Arrhythmias · Dysrhythmia)

Abrasions (Cuts and Scrapes · Wound Care)

Acne (Pimples · Zits)

Acne Rosacea (Rosacea)

Actinic Keratosis (Precancerous Skin Lesion · Solar Keratosis)

Acute Exacerbations of Chronic Bronchitis (AECB)

ADD (Attention Deficit Hyperactivity Disorder · ADHD · Attention Deficit Disorder)

Addiction (Substance Use Problems · Drug Abuse)

Addison's Anemia (Pernicious Anemia · Vitamin B12 Deficiency · Congenital Pernicious Anemia · Combined Systems Disease)

Addison's Disease (Adrenal Insufficiency · Hypocortisolism · Primary Adrenal Insufficiency)

ADHD (Attention Deficit Hyperactivity Disorder · Attention Deficit Disorder · ADD)

Adolescent Suicide (Teen Suicide)

Adrenal Insufficiency (Addison's Disease · Hypocortisolism · Primary Adrenal Insufficiency)

AECB (Acute Exacerbations of Chronic Bronchitis)

Agoraphobia (Social Phobia)

AIDS (HIV/AIDS · Human Immunodeficiency Virus)

Alcohol Abuse (Alcohol Use · Alcoholism · Alcohol Dependence)

Alcohol Dependence (Alcohol Use · Alcoholism · Alcohol Abuse)

Alcohol Use (Alcoholism · Alcohol Abuse · Alcohol Dependence)

Alcoholism (Alcohol Use · Alcohol Abuse · Alcohol Dependence)

Allergic Rhinitis (Allergies · Hay Fever · Pollinosis)

Allergies (Allergic Rhinitis · Hay Fever · Pollinosis)

Alopecia (Hair Loss · Baldness)

ALS (Lou Gehrig's Disease · Amyotrophic Lateral Sclerosis)

Altitude Sickness (High Altitude Sickness · Mountain Sickness)

Alzheimer's Disease (Senility · Senile Dementia)

Amyotrophic Lateral Sclerosis (ALS · Lou Gehrig's Disease)

Anaphylaxis

Andropause (Low Testosterone · Male Menopause · Manopause · Testosterone Deficiency)

Anemia

Anemia of Chronic Disease (Anemia of Inflammation · Iron Reutilization Anemia)

Anemia of Inflammation (Anemia of Chronic Disease · Iron Reutilization Anemia)

Aneurysm (Brain Aneurysm · Aortic Aneurysm)

Angina (Angina Pectoris)

Angina Pectoris (Angina)

Angioplasty (Heart Artery Dilation · PCTA · PCI · Balloon Angioplasty)

Ankylosing Spondylitis

Anorexia (Eating Disorders · Bulimia)

Anthrax (Bacillus anthracis Infection · Cutaneous Anthrax · Inhalation Anthrax · Intestinal Anthrax)

Anxiety Disorders

Aortic Aneurysm (Aneurysm · Brain Aneurysm)

Aphthous Ulcers (Canker Sores · Mouth Ulcers)

Aplastic Anemia (Aregenerative Anemia · Panmyelopathy · Hypoplastic Anemia · Toxic Paralytic Anemia)

Appendicitis

Arachnodactyly (Marfan's Syndrome)

Aregenerative Anemia (Aplastic Anemia · Panmyelopathy · Hypoplastic Anemia · Toxic Paralytic Anemia)

Arrhythmias (Abnormal Heart Rhythms · Dysrhythmia)

Arthritis

Asbestosis

Asthma

Astigmatism

Athlete's Foot (Tinea Pedis · Foot Ringworm)

Athletic Injuries (Sports Injuries)

Atrial Fibrillation

Attention Deficit Disorder (Attention Deficit Hyperactivity Disorder · ADHD · ADD)

Attention Deficit Hyperactivity Disorder (ADHD · Attention Deficit Disorder · ADD)

Atypical Pneumonia (SARS · Severe Acute Respiratory Syndrome)

Autism

Avian Influenza (Bird Flu · Flu, Avian · Influenza, Bird)