Sjogren's Syndrome (pronounced show grins) is a condition in which the body recognizes its own tissues as foreign invaders and directs war against them.
With Sjogren's the main tissues attacked are the exocrine glands - the sweat glands. The main symptoms are dry eyes and dry mouth but because it is an autoimmune condition the body can attack many other areas besides the sweat glands. It can have more general effects such as fatigue and aching joints or muscles.
Lots of info on Sjogren's Syndrome