Nervous system
Attention deficit hyperactivity disorder (ADHD)
Non-infectious · Chronic
A neurodevelopmental condition causing ongoing difficulties with attention, hyperactivity and impulsivity that affect daily life.
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Disease encyclopedia
Causes, symptoms, diagnosis, treatment approaches and prevention for common conditions. Browse A–Z, by body system, or search.
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Nervous system
Nervous system
Autism spectrum disorder
Non-infectious · Chronic
A lifelong neurodevelopmental difference affecting social communication and interaction, with focused interests and repetitive behaviours.
Digestive system
Autoimmune hepatitis
Non-infectious · Chronic
A long-term liver disease in which the immune system attacks liver cells, causing inflammation that can lead to cirrhosis if untreated.
Nervous system
Autonomic neuropathy
Non-infectious · Chronic
Damage to the nerves that control automatic body functions such as blood pressure, heart rate, digestion, bladder and sweating.
Musculoskeletal system
Avascular necrosis
Non-infectious · Chronic
Death of bone tissue caused by loss of blood supply, most often affecting the hip, which can lead to bone collapse and arthritis.
Digestive system
Avoidant restrictive food intake disorder (ARFID)
Non-infectious · Chronic
An eating disorder in which a person avoids or restricts food because of sensory sensitivity, fear of choking or vomiting, or low interest in eating, not because of body image.