“Explore our comprehensive A-Z guide on diseases and conditions. Discover detailed information on definitions, symptoms, causes, and treatments to better understand various health issues.”
- AA Amyloidosis
- Abdominal Adhesions
- Abdominal Aortic Aneurysm
- Abdominal Compartment Syndrome
- Abdominal Migraine
- Abdominal Muscle Strain
- Abnormal Uterine Bleeding
- Abrasion (Scrape)
- Abscess
- Abscessed Tooth
- Absence Seizures
- Acanthamoeba Keratitis
- Acanthosis Nigricans
- Acetabular Fractures
- Acetaminophen Toxicity & Overdose
- Achalasia
- Achilles Paratenonitis
- Achilles Tendinitis
- Achilles Tendon Rupture
- Achondroplasia
- Achromatopsia
- Acid Reflux & GERD
- ACL Tear
- Acne
- Acne Keloidalis Nuchae
- Acne Papules
- Acne Scars
- Acoustic Neuroma
- Acrocyanosis
- Acromegaly
- Acrophobia: Fear of Heights
- Actinic Cheilitis
- Actinic Keratosis
- Actinomycosis
- Acute Abdomen
- Acute Aortic Syndrome
- Acute Arterial Occlusion
- Acute Chest Syndrome
- Acute Coronary Syndrome
- Acute Cutaneous Lupus
- Acute Cystitis
- Acute Disseminated Encephalomyelitis (ADEM)
- Acute Fatty Liver of Pregnancy
- Acute Flaccid Myelitis
- Acute Heart Failure
- Acute Hepatic Porphyria
- Acute Lymphoblastic Leukemia (ALL)
- Acute Mechanical Back Pain
- Acute Myeloid Leukemia (AML)
- Acute Pericarditis
- Acute Promyelocytic Leukemia
- Acute Respiratory Distress Syndrome (ARDS)
- Acute Sinusitis
- Acute Stress Disorder
- Acute Tubular Necrosis
- Acyanotic Heart Disease
- Addiction
- Addison’s Disease
- Adenocarcinoma Cancers
- Adenoid Cystic Carcinoma (ACC)
- Adenomas
- Adenomyosis
- Adenovirus
- ADHD in Women
- Adjustment Disorders
- Adnexal Mass (Tumors)
- Adrenal Adenoma
- Adrenal Cancer
- Adrenal Crisis
- Adrenal Gland Disorders
- Adrenocortical Carcinoma
- Adult Acquired Flatfoot
- Adult Congenital Heart Disease
- Adult-Onset Still’s Disease
- Advanced Maternal Age
- Adventitial Cystic Disease
- Aerophobia (Fear of Flying)
- Agenesis of the Corpus Callosum (ACC)
- Ageusia (Loss of Taste)
- Agnosia
- Agoraphobia
- Agranulocytosis
- Aicardi Syndrome
- Aichmophobia
- Ailurophobia (Fear of Cats)
- Akathisia
- AL Amyloidosis (Primary Amyloidosis)
- Alagille Syndrome
- Albinism
- Alcohol Intolerance
- Alcohol Poisoning
- Alcohol Use Disorder
- Alcohol Withdrawal
- Alcohol-Induced Cardiomyopathy
- ALD (Adrenoleukodystrophy)
- Alektorophobia (Fear of Chickens or Hens)
- Alexander Disease
- Algophobia (Fear of Pain)
- Alice in Wonderland Syndrome
- Allergic Asthma
- Allergic Rhinitis (Hay Fever)
- Allergic Shiners
- Allergies
- Allergies: Shellfish
- Alopecia Areata
- Alpers Disease
- Alpha-1 Antitrypsin Deficiency
- Alpha-gal Syndrome
- Alport Syndrome
- Altered Mental Status
- Altitude Sickness
- Alzheimer’s Disease
- Alzheimer’s Disease and Down Syndrome
- Amaurosis Fugax
- Amaxophobia (Fear of Driving)
- Amblyopia (Lazy Eye)
- Amebiasis (Amoebic Dysentery)
- Ameloblastoma
- Amenorrhea
- Amnesia
- Amniotic Band Syndrome
- Amniotic Fluid Embolism
- Amplified Musculoskeletal Pain Syndrome (AMPS) in Children
- Ampullary Cancer
- Amyloidosis
- Amyoplasia
- Amyotrophic Lateral Sclerosis (ALS)
- Anal Cancer
- Anal Dysplasia
- Anal Fissures
- Anal Fistula
- Anal Itching
- Anal Stenosis
- Anal Warts
- Anal Yeast Infection
- Anaphylaxis
- Anaplasmosis
- Anaplastic Large Cell Lymphoma
- Anaplastic Thyroid Cancer
- Anasarca
- Anastomotic Leak
- Androgen Insensitivity Syndrome
- Androphobia
- Anejaculation
- Anemia
- Anemia During Pregnancy
- Anemia in Newborns
- Anemia of Chronic Disease
- Anemia Rash
- Anencephaly
- Aneuploidy
- Aneurysm
- Aneurysmal Bone Cyst
- Angelman Syndrome
- Angina
- Anginophobia (Fear of Chest Pain)
- Angioedema
- Angioid Streaks
- Angioimmunoblastic T-cell Lymphoma (AITL)
- Angiokeratoma
- Angiolipoma
- Angiomatoid Fibrous Histiocytoma
- Angiomyolipoma of the Kidney
- Angiosarcoma
- Angle-Closure Glaucoma
- Angular Cheilitis
- Anhidrosis (Lack of Sweat)
- Aniridia (Absence of Iris)
- Anismus
- Anisocoria
- Anisocytosis
- Anisometropia
- Ankle Injuries
- Ankylosing Spondylitis
- Anodontia
- Anomalous Coronary Artery
- Anorectal Malformation
- Anorexia Nervosa
- Anorgasmia
- Anosmia (Loss of Sense of Smell)
- Anosognosia
- Anovulation
- Ant Bites
- Anterior Knee Pain (Pes Anserinus Bursitis)
- Anterior Placenta
- Anterograde Amnesia
- Anteverted Uterus
- Anthophobia (Fear of Flowers)
- Anthrax
- Anthropophobia (Fear of People)
- Antidepressant Discontinuation Syndrome
- Antigens
- Antiphospholipid Syndrome
- Antisocial Personality Disorder (ASPD)
- Antisynthetase Syndrome
- Antithrombin Deficiency
- Anuria
- Anxiety Disorders
- Anxiety in Children
- Aortic Aneurysm
- Aortic Coarctation
- Aortic Dissection
- Aortic Regurgitation
- Aortic Valve Disease
- Aortic Valve Stenosis
- Aortitis
- Aortoiliac Occlusive Disease
- Aortopathy
- Apert Syndrome
- Aphakia
- Aphallia
- Aphasia
- Aphonia (Loss of Voice)
- Aplasia
- Aplastic Anemia
- Aplastic Crisis
- Appendicitis
- Appendicitis in Children
- Appendicolith
- Appendix Cancer
- Aquagenic Pruritus
- Aquaphobia (Fear of Water)
- Arachnoid Cysts
- Arachnoiditis
- Arachnophobia (Fear of Spiders)
- Arcuate Uterus
- Argyria
- Arithmophobia (Fear of Numbers)
- Armpit Yeast Infection
- Arrhythmia
- Arrhythmia Treatment During Congenital Heart Disease
- Arrhythmias in Children
- Arrhythmogenic Right Ventricular Dysplasia
- Arsenic Poisoning
- Arterial Insufficiency
- Arterial Thoracic Outlet Syndrome
- Arteriosclerosis
- Arteriovenous Fistula
- Arteriovenous Malformation
- Arthritis
- Arthritis in Wrist
- Arthritis of the Hand
- Arthritis of the Knee
- Arthrogryposis
- Arthus Reaction
- Articulation Disorder
- Asbestos Exposure
- Asbestosis
- Ascariasis
- Ascending Aortic Aneurysm
- Ascites
- Asherman’s Syndrome
- Asperger Syndrome
- Aspergillosis
- Asphyxiation
- Aspiration Pneumonia
- Asteatotic Eczema
- Asteroid Hyalosis
- Asthma
- Asthma & Pregnancy
- Asthma Attack
- Astigmatism
- Astraphobia (Fear of Thunder and Lightning)
- Astrocytoma
- Astrovirus
- Asymptomatic Bacteriuria
- Ataxia-Telangiectasia
- Ataxophobia (Fear of Untidiness or Disorder)
- Atelectasis
- Atelophobia (Fear of Imperfection)
- Atherosclerosis
- Atherosclerosis of Aorta
- Athetoid Cerebral Palsy
- Athlete’s Heart
- Athlete’s Foot (Tinea Pedis)
- Atonic Seizure
- Atopic Dermatitis
- Atrial Arrhythmia
- Atrial Fibrillation With RVR
- Atrial Flutter
- Atrial Septal Aneurysm
- Atrial Septal Defect
- Atrial Tachycardia
- Atrioventricular Canal Defect
- Atrioventricular Nodal Reentrant Tachycardia (AVNRT)
- Atrophic Gastritis
- Atrophic Rhinitis
- Attention-Deficit/Hyperactivity Disorder (ADHD)
- Attention-Deficit/Hyperactivity Disorder (ADHD) in Adults
- Atychiphobia (Fear of Failure)
- Atypical (Walking) Pneumonia
- Atypical Anorexia
- Atypical Depression
- Atypical Ductal Hyperplasia
- Atypical Face Pain
- Atypical Genitalia (Formerly Known as Ambiguous Genitalia)
- Atypical Hemolytic Uremic Syndrome
- Auditory Processing Disorder (APD)
- Autism Spectrum Disorder
- Autoimmune Autonomic Ganglionopathy
- Autoimmune Diseases
- Autoimmune Hemolytic Anemia
- Autoimmune Hepatitis
- Autoimmune Neutropenia
- Autoimmune Pancreatitis
- Autonomic Dysreflexia (AD)
- Autophobia (Fear of Being Alone)
- Avascular Necrosis (Osteonecrosis)
- Avoidant Personality Disorder
- Avoidant/Restrictive Food Intake Disorder (ARFID)
- Avulsed Tooth
- Avulsion Fracture
- Axenfeld-Rieger Syndrome
- Axial Spondyloarthritis
- Axillo-Subclavian Vein Thrombosis
- Azoospermia
- Azotemia