Postural Orthostatic Tachycardia Syndrome
- Patient's report on causes, symptoms, and treatment.
- http://home.att.net/~potsweb/POTS.html

What is Orthostatic Intolerance?
- An article about orthostatic tachycardia syndrome (POTS). What it is, the prognosis as well as all the names used to refer to this disorder.
- http://www.mc.vanderbilt.edu/gcrc/adc/oi.html