Dry eyes, dry mouth, joint pain and chronic fatigue – Sjorgen's syndrome affects one in every 200 people

She may be known the world over for her prowess on the tennis court, but Venus Williams is also well-known in certain circles as being a famous face for a rare condition. The tennis player has Sjogren’s syndrome, an autoimmune disease which affects approximately one in 200 people in the developed world. It causes the glands which produce saliva and tears to become inflamed and badly damaged.