Immune system
Illnesses, deficiencies and disorders of the immune system
Allergies
Learn more about allergies and their symptoms and treatments
Anaphylaxis
Learn about anaphylaxis symptoms and treatments
Hay fever
Find out more about hay fever symptoms and treatments
Self-help guide: Hay fever
Advice for people aged 5 years or more with the symptoms of hay fever
HIV
Learn about HIV symptoms and treatments
Lupus
Learn about lupus symptoms and treatments
Polio
Polio symptoms, causes and treatments
Sjogren's syndrome
Learn about Sjögren's syndrome symptoms and treatments