A common sign of dysautonomia is orthostatic intolerance which means you cant stand up for long without feeling faint or dizzy other signs and symptoms of dysautonomia you may experience include certain conditions and events can bring on the symptoms of dysautonomia. If dizziness on standing up is the chief problem postural orthostatic tachycardia syndrome pots is the diagnosis diarrhea or abdominal pain buys you irritable bowel syndrome pain elsewhere ends up being fibromyalgia whatever the diagnosis however a dysfunctional autonomic nervous system almost always plays a major part in causing the symptoms by all means keep in mind . Dysautonomia refers to a wide range of conditions that affect the autonomic nervous system symptoms include fainting cardiovascular issues and breathing problems it is linked to conditions such. Many pots patients also experience fatigue headaches lightheadedness heart palpitations exercise intolerance nausea diminished concentration tremulousness shaking syncope fainting coldness or pain in the extremities chest pain and shortness of breath 134 patients can develop a reddish purple color in the legs upon standing believed to be caused by blood pooling or poor circulation