Hello! Welcome and thank you for asking on HCM! I understand your concern and would explain that low blood pressure could be related to different causes: - chronic anemia - dehydration - electrolytes imbalances from malnutrition - orthostatic hypotension, etc.. I would recommend performing some tests to investigate for the possible cause: - a resting ECG (as you refer to have a fast heart rate) - blood lab tests (complete blood count, blood electrolytes, kidney and liver function tests) A head up tilt test would be necessary to exclude possible orthostatic hypotension. If all these tests result normal there is nothing to worry about. Meanwhile, I would recommend avoiding prolonged standing up position and take plenty of fluids (water, juices) to stay well hydrates. An increase in the salt and caffeine intake could help in raising blood pressure. Hope to have been helpful! Greetings! Dr. Iliri