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Study proves that postural orthostatic tachycardia syndrome may be an autoimmune disorder The symptoms of postural orthostatic tachycardia syndrome, or POTS, can be as varied as they are confounding. There can be fatigue, pain, bleeding disorders and anxiety. Heart palpitations and lightheadedness are common. Some patients experience gastrointestinal issues or brain fog. For the most severely affected, the simple act of standing up can send them crumpling into unconsciousness. Though likely much more common than once thought, POTS remains something of a mystery. Many physicians have never he...

 E-Mail IMAGE: Dr. Blair Grubb, right, a cardiologist at The University of Toledo Medical Center and Distinguished University Professor in the UToledo College of Medicine and Life Sciences, and Dr. William Gunning,... view more  Credit: Daniel Miller / The University of Toledo The symptoms of postural orthostatic tachycardia syndrome, or POTS, can be as varied as they are confounding. There can be fatigue, pain, bleeding disorders and anxiety. Heart palpitations and lightheadedness are common. Some patients experience gastrointestinal issues or brain fog. For the most severely affe...