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Cortisol helps to maintain blood pressure, immune function and the body's anti-inflammatory processes.

Lupus most commonly appears in women of childbearing age.

Iritis can cause vision problems if it is not treated.

Eczema can vary in severity, and symptoms may flare up or subside from day to day.

Polymyositis is hard to diagnose and may be mistaken for muscular dystrophy.

Typical symptoms of polymyalgia rheumatica include severe muscle aches and stiffness, particularly in the neck, shoulders and thighs.

Giant cell arteritis is inflammation of the arteries that can cause sudden blindness in one or both eyes.

Dupuytren's contracture gradually causes clawing of the fingers as they are pulled towards the palm.

Myasthenia gravis is an autoimmune disease that causes muscle weakness.

The majority of people with Bell's palsy, around 90 per cent, will recover completely with time.