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240 conditions. Common concerns and rare diagnoses, explained with links to medical sources.
Aarskog-Scott syndrome
Aarskog-Scott syndrome affects development of the skeleton, face and genital system. Its features vary, with males generally more noticeably affected.
Read the article ↗Rare metabolic disorders · Rare conditionAbetalipoproteinemia
Inherited impairment of fat transport interferes with absorption of fats and certain vitamins. Nutritional effects can later involve vision, nerves and coordination.
Read the article ↗Rare skeletal disorders · Rare conditionAchondroplasia
Achondroplasia changes cartilage-to-bone growth, particularly in the long bones. Short limbs are a characteristic feature, while some complications involve breathing or nerve compression.
Read the article ↗Rare eye disorders · Rare conditionAchromatopsia
Achromatopsia impairs cone-cell function in the retina. It can reduce color discrimination and visual detail, particularly in bright light.
Read the article ↗Skin and hairAcne
Acne develops when hair follicles become blocked and inflamed. Severity ranges from small spots to deeper lesions that may scar.
Read the article ↗Lungs and breathingAcute Bronchitis
Acute bronchitis is short-term inflammation of the larger airways, often following a viral infection. A cough can persist after other symptoms improve.
Read the article ↗Rare developmental disorders · Rare conditionAdams-Oliver syndrome
Adams-Oliver syndrome combines areas of missing skin at birth with limb-development differences. Some people also have vascular or internal-organ abnormalities.
Read the article ↗Rare immune disorders · Rare conditionAdenosine deaminase deficiency
Adenosine deaminase deficiency disrupts development of immune cells and can cause severe combined immunodeficiency. Serious infections may begin early in infancy.
Read the article ↗Eyes and visionAge-related macular degeneration
Age-related macular degeneration affects the central retina used for detailed vision. It can make reading or recognizing faces difficult while peripheral vision remains relatively preserved.
Read the article ↗Rare liver disorders · Rare conditionAlagille syndrome
Alagille syndrome can reduce or alter bile ducts and affect several other organs. Impaired bile drainage may injure the liver and interfere with growth.
Read the article ↗Mental healthAlcohol use disorder
Alcohol use disorder involves impaired control over drinking despite harmful consequences. Withdrawal can become dangerous, so a person needing help should receive medical assessment.
Read the article ↗Rare metabolic disorders · Rare conditionAlkaptonuria
Alkaptonuria causes accumulation of a substance that darkens urine and connective tissues. Over time, pigment buildup can damage joints and other tissues.
Read the article ↗Rare kidney disorders · Rare conditionAlport syndrome
Alport syndrome affects structural proteins important to the kidneys and other tissues. Progressive kidney disease may occur alongside hearing or eye changes.
Read the article ↗Brain and nervesAlzheimer's Disease
Alzheimer's disease gradually damages memory and other thinking abilities. Progression can affect independence, behavior and the need for family or caregiver support.
Read the article ↗Immune healthAnaphylaxis
Anaphylaxis is a rapidly developing severe allergic reaction. Breathing or circulation can become impaired, and skin symptoms are not always present.
Read the article ↗Rare developmental disorders · Rare conditionAngelman syndrome
Angelman syndrome is a genetic condition affecting nervous-system development. Communication, balance and seizure-related support needs vary between individuals.
Read the article ↗Bones and jointsAnkylosing Spondylitis
Ankylosing spondylitis is inflammatory arthritis involving the spine and nearby pelvic joints. Persistent inflammation can limit movement and may involve the eyes or other joints.
Read the article ↗Heart and circulationAortic Aneurysm
An aortic aneurysm is a weakened, enlarged section of the body's main artery. Many cause no symptoms until they grow or develop a dangerous complication.
Read the article ↗Rare skeletal disorders · Rare conditionApert syndrome
Apert syndrome causes early fusion of skull bones and fusion of fingers or toes. These changes can affect head growth, breathing and hand function.
Read the article ↗Digestive healthAppendicitis
Appendicitis is inflammation of the appendix, often following a blockage. A ruptured appendix can spread infection within the abdomen.
Read the article ↗Rare metabolic disorders · Rare conditionArgininosuccinic aciduria
Argininosuccinic aciduria impairs disposal of nitrogen waste through the urea cycle. Toxic ammonia accumulation can cause a rapidly worsening neurological illness.
Read the article ↗Lungs and breathingAsthma
Asthma causes variable inflammation and narrowing of the airways. Symptoms may fluctuate and can suddenly worsen during a flare.
Read the article ↗Rare neurological disorders · Rare conditionAtaxia-telangiectasia
Ataxia-telangiectasia affects movement coordination and immune function. It also increases susceptibility to certain cancers and requires coordinated specialist care.
Read the article ↗Heart and circulationAtrial Fibrillation
Atrial fibrillation is an irregular heart rhythm involving the upper chambers. It can increase the likelihood of stroke, even when palpitations are absent.
Read the article ↗Articles are a starting point for a conversation with a clinician. They do not identify a disease from symptoms. Group labels are editorial; frequency varies by population.