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When people with inflammatory bowel disease (Crohn's disease and ulcerative colitis) are not experiencing a flare-up of their illness, they feel quite well and are often free of symptoms.

Granulomatosis with polyangiitis (GPA), formerly known as Wegener granulomatosis is a rare condition that targets the arteries, veins and capillaries of the kidneys and the respiratory system.

Belief in a treatment may be enough to change the course of a person's physical illness.

Multiple sclerosis is not contagious, but it is progressive and unpredictable.

If you are travelling or passing through areas infected with yellow fever, some countries require you to be vaccinated.

Type 2 diabetes may be prevented, but it cannot be cured.

In men, severe rosacea can cause the nose to become reddened and enlarged (rhinophyma).

Myasthenia gravis is an autoimmune disease that causes muscle weakness.

Hyperthyroidism can be diagnosed with a simple blood test that measures thyroid hormone levels.

Lymphoma is a general term for a cancer that begins in the lymphatic system.