All Diseases that Start with A (Rare, Deadly, and Many More!)

Welcome to our comprehensive exploration of diseases that begin with the letter ‘A’. In this detailed guide, we’ll delve into a wide range of ailments, covering everything from blood and bone disorders to conditions affecting the eyes, lungs, and skin.

Our discussion is not limited to humans; we’ll also touch upon diseases in dogs and cats. Expect insights into deadly and rare diseases, autoimmune conditions, bacterial infections, and much more.

Stay tuned as we navigate through this alphabet of ailments, shedding light on each with clarity and depth.

Top 100 Diseases that Start with A

Below are the top 100 diseases starting with the letter ‘A’.

  • Acanthamoeba Keratitis: Eye infection by amoeba
  • Acidosis: Excessive blood acidity
  • Acne: Common skin condition
  • Acromegaly: Hormonal growth disorder
  • Actinomycosis: Bacterial infectious disease
  • Acute Bronchitis: Short-term bronchial inflammation
  • Acute Myeloid Leukemia: Rapidly progressing blood cancer
  • Addison’s Disease: Adrenal gland insufficiency
  • Adenovirus Infection: Virus affecting various organs
  • Adhesive Capsulitis: Painful, stiff shoulder
  • Adrenoleukodystrophy: Genetic brain disorder
  • Adult Still’s Disease: Inflammatory arthritis
  • Agoraphobia: Anxiety disorder about open spaces
  • AIDS (Acquired Immunodeficiency Syndrome): Advanced HIV stage
  • Albinism: Lack of skin pigment
  • Alcoholic Hepatitis: Liver inflammation by alcohol
  • Allergies: Immune system reactions
  • Alopecia Areata: Patchy hair loss
  • Alport Syndrome: Kidney disease with hearing loss
  • Alzheimer’s Disease: Progressive brain disorder
  • Amebiasis: Parasitic gut infection
  • Amyloidosis: Abnormal protein accumulation
  • Amyotrophic Lateral Sclerosis (ALS): Neurodegenerative disease
  • Anal Fissure: Tear in the anus lining
  • Anaphylaxis: Severe allergic reaction
  • Anemia: Blood cell deficiency
  • Aneurysm: Blood vessel bulge
  • Angelman Syndrome: Genetic brain disorder
  • Angina Pectoris: Chest pain from the heart
  • Ankylosing Spondylitis: Spinal arthritis
  • Anorexia Nervosa: Eating disorder
  • Anthrax: Serious bacterial infection
  • Antiphospholipid Syndrome: Blood clot autoimmune disorder
  • Anxiety Disorders: Chronic nervousness
  • Aortic Aneurysm: Major blood vessel bulge
  • Aortic Dissection: Tear in the aorta
  • Aortic Stenosis: Narrowed heart valve
  • Aphasia: Language impairment
  • Appendicitis: Appendix inflammation
  • Apraxia: Motor skill disorder
  • Arachnoiditis: Spine inflammation
  • Argyria: Skin discoloration by silver
  • Arteriovenous Malformation: Blood vessel defect
  • Arthritis: Joint inflammation
  • Asbestosis: Lung damage from asbestos
  • Ascariasis: Intestinal roundworm infection
  • Aseptic Meningitis: Non-bacterial meningitis
  • Asperger’s Syndrome: Autism spectrum disorder
  • Aspergillosis: Fungal lung infection
  • Astigmatism: Distorted vision
  • Astrocytoma: Brain tumor
  • Atelectasis: Partial lung collapse
  • Atherosclerosis: Artery plaque buildup
  • Athlete’s Foot: Fungal foot infection
  • Atopic Dermatitis: Eczema, skin inflammation
  • Atrial Fibrillation: Irregular heart rhythm
  • Atrial Septal Defect: Heart wall hole
  • Atrophy: Organ shrinkage
  • Attention Deficit Hyperactivity Disorder (ADHD): Focus issue
  • Autism Spectrum Disorder: Developmental disorder
  • Autoimmune Hepatitis: Liver autoimmune disease
  • Avascular Necrosis: Bone death from blood loss
  • Azoospermia: No sperm in semen
  • Azotemia: Elevated blood nitrogen
  • Abetalipoproteinemia: Fat absorption disorder
  • Ablepharon-Macrostomia Syndrome: Rare genetic disorder
  • Abruzzo-Erickson Syndrome: Developmental disorder
  • Absence Epilepsy: Seizure disorder
  • Acanthosis Nigricans: Skin pigmentation disorder
  • Acardia: Absence of heart
  • Acatalasemia: Lack of enzyme catalase
  • Accessory Navicular Syndrome: Foot bone issue
  • Achalasia: Esophagus swallowing disorder
  • Achondrogenesis: Bone growth disorder
  • Achondroplasia: Dwarfism
  • Acid Maltase Deficiency: Glycogen storage disease
  • Acid Sphingomyelinase Deficiency: Genetic lipid storage disorder
  • Ackerman Syndrome: Skin and muscle disorder
  • Acoustic Neuroma: Brain tumor
  • Acquired Aplastic Anemia: Bone marrow failure
  • Acquired Hemophilia: Rare bleeding disorder
  • Acrocallosal Syndrome: Genetic brain and limb disorder
  • Acrodysostosis: Skeletal abnormalities
  • Acromicric Dysplasia: Bone growth disorder
  • Actinic Keratosis: Skin lesions from sun
  • Acute Flaccid Myelitis: Sudden muscle weakness
  • Acute Intermittent Porphyria: Metabolic disorder
  • Acute Lymphoblastic Leukemia: Blood and bone marrow cancer
  • Acute Myocardial Infarction: Heart attack
  • Acute Pancreatitis: Inflammation of the pancreas
  • Acute Respiratory Distress Syndrome (ARDS): Severe lung condition
  • Adams-Oliver Syndrome: Limb and scalp defect
  • Adducted Thumb Syndrome: Congenital hand anomaly
  • Adenoid Cystic Carcinoma: Glandular tumor
  • Adenoma: Benign glandular tumor
  • Adie Syndrome: Neurological eye disorder
  • Adrenocortical Carcinoma: Adrenal gland cancer
  • Adrenomyeloneuropathy: Genetic neurological disorder
  • Adult-Onset Still’s Disease: Inflammatory disease
  • Aerophagia: Swallowing too much air

Also, Check:

Medical Terms That Start With A

Fitness Words That Start With A

Rare Diseases That Start With ‘A’

  • Aarskog-Scott Syndrome
  • Abdominal Cystic Lymphangioma
  • Abernethy Malformation
  • Abetalipoproteinemia
  • Ablepharon-Macrostomia Syndrome
  • Abramov Syndrome
  • Absent Corpus Callosum Cataract Immunodeficiency
  • Acanthamoeba Infection
  • Acanthocheilonemiasis
  • Acanthosis Nigricans
  • Accessory Pancreas
  • Acquired Angioedema
  • Acquired Aplastic Anemia
  • Acquired Hemophilia A
  • Acrocallosal Syndrome
  • Acrocephalopolydactylous Dysplasia
  • Acrodermatitis Enteropathica
  • Acrodysostosis
  • Acromegaloid Features, Overgrowth, Cleft Palate, and Hernia
  • Acromicric Dysplasia

Deadly Diseases That Start With ‘A’

  • Acute Myeloid Leukemia
  • Acute Pancreatitis
  • Acute Respiratory Distress Syndrome (ARDS)
  • Addison’s Disease
  • Adenoid Cystic Carcinoma
  • Adrenocortical Carcinoma
  • AIDS (Acquired Immunodeficiency Syndrome)
  • Alcoholic Hepatitis
  • Alport Syndrome
  • Alzheimer’s Disease
  • Amebiasis
  • Amyloidosis
  • Amyotrophic Lateral Sclerosis (ALS)
  • Anaphylaxis
  • Aneurysm
  • Angina Pectoris
  • Anorexia Nervosa
  • Anthrax
  • Antiphospholipid Syndrome
  • Aortic Aneurysm
  • Aortic Dissection
  • Aortic Stenosis
  • Appendicitis
  • Arteriovenous Malformation
  • Asbestosis
  • Ascariasis
  • Aseptic Meningitis
  • Aspergillosis
  • Astrocytoma
  • Atherosclerosis
  • Atrial Fibrillation
  • Atrial Septal Defect
  • Atrophy
  • Attention Deficit Hyperactivity Disorder (ADHD)
  • Autoimmune Hepatitis
  • Avascular Necrosis
  • Azotemia

Explore More Diseases Starting With:


Other Diseases Beginning With ‘A’ (Divided By Type)

Autoimmune Diseases That Start With ‘A’

  • Addison’s Disease
  • Adult-Onset Still’s Disease
  • Alopecia Areata
  • Ankylosing Spondylitis
  • Antiphospholipid Syndrome
  • Autoimmune Hepatitis
  • Autoimmune Inner Ear Disease

Blood Diseases That Start With ‘A’

  • Acquired Aplastic Anemia
  • Acquired Hemophilia
  • Acute Lymphoblastic Leukemia
  • Acute Myeloid Leukemia
  • Anemia
  • Antiphospholipid Syndrome
  • Aplastic Anemia
  • Arginase Deficiency

Bone Diseases That Start With ‘A’

  • Achondrogenesis
  • Achondroplasia
  • Acrocallosal Syndrome
  • Acrodysostosis
  • Acromegaly
  • Acromicric Dysplasia
  • Avascular Necrosismmmm

Mental Diseases That Start With ‘A’

  • Adjustment Disorders
  • Agoraphobia
  • Alcohol Use Disorder
  • Alzheimer’s Disease
  • Amnestic Disorder
  • Anorexia Nervosa
  • Antisocial Personality Disorder
  • Anxiety Disorders
  • Anankastic Personality Disorder
  • Asperger’s Syndrome
  • Attention Deficit Hyperactivity Disorder (ADHD)
  • Autism Spectrum Disorder
  • Avoidant Personality Disorder
  • Acute Stress Disorder
  • Alexithymia
  • Atypical Depression
  • Auditory Processing Disorder

Eyes Diseases That Start With ‘A’

  • Acanthamoeba Keratitis
  • Acute Conjunctivitis
  • Age-Related Macular Degeneration
  • Amblyopia
  • Aniridia
  • Anophthalmia
  • Astigmatism

Ear Diseases That Start With ‘A’

  • Acoustic Neuroma
  • Acute Otitis Media
  • Autoimmune Inner Ear Disease
  • Age-Related Hearing Loss
  • Alport Syndrome (related hearing loss)
  • Ankyloglossia

Hand Diseases That Start With ‘A’

  • Acrocallosal Syndrome
  • Acrodysostosis
  • Adducted Thumb Syndrome
  • Ainhum
  • Alkaptonuria
  • Amniotic Band Syndrome

Lung Diseases That Start With ‘A’

  • Acute Bronchitis
  • Acute Respiratory Distress Syndrome (ARDS)
  • Alveolar Capillary Dysplasia
  • Asbestosis
  • Aspergillosis
  • Asthma
  • Atelectasis

Liver Diseases That Start With ‘A’

  • Alagille Syndrome
  • Alcoholic Hepatitis
  • Alpha-1 Antitrypsin Deficiency
  • Autoimmune Hepatitis
  • Amebic Liver Abscess
  • Acute Liver Failure

Heart Diseases That Start With ‘A’

  • Aortic Aneurysm
  • Aortic Dissection
  • Aortic Stenosis
  • Arrhythmogenic Right Ventricular Dysplasia
  • Atherosclerosis
  • Atrial Fibrillation
  • Atrial Septal Defect

Skin Diseases That Start With ‘A’

  • Acne
  • Actinic Keratosis
  • Acanthosis Nigricans
  • Alopecia Areata
  • Atopic Dermatitis
  • Acrodermatitis Enteropathica
  • Angioedema

Bacterial Infection That Start With ‘A’

  • Actinomycosis
  • Anthrax
  • Amebiasis
  • Acinetobacter Infection
  • Arcanobacterium Haemolyticum Infection
  • Atypical Mycobacterial Infection

Dog Diseases That Start With ‘A’

  • Alopecia
  • Arthritis
  • Aspergillosis
  • Aortic Stenosis
  • Atopy
  • Autoimmune Hemolytic Anemia

Cat Diseases That Start With ‘A’

  • Asthma
  • Aortic Thromboembolism
  • Amyloidosis
  • Autoimmune Hemolytic Anemia
  • Alopecia
  • Atopic Dermatitis

Diseases that Start with A

Last updated on November 10th, 2023 at 03:26 pm