Can extreme iron deficiency cause pots?

Probably not: Postural tachycardia syndrome is complex overlapping syndrome of unknown causes. Cfs/fm are a part of this array. You and your doc should be able to correct you iron levels, once stable if the pots goes away, that is a 1 to 1 relationship. If when the iron is correct and you still having pots, you need to balance yourself and get a 2nd opinion. Begin a self-care w a wellness program. See my page.

POTS: If you mean postural orthostatic tachycardia syndrome, the answer is no. Pots is a dysautonomic problem, where a change from lying down to an upright position causes an abnormally large increase in heart rate (tachycardia). Though these symptoms can happen with low blood volume & iron deficiency anemia, pots is not related to amount of blood volume, or the oxygen-carrying capacity of the blood.