Hello! Welcome and thank you for asking on HCM! Regarding your concern, I would explain that these blood pressure fluctuations are quite normal in every healthy individual. You should know that they are related to our body state and position (active, sleeping, sitting, laying down, eating, anxiety, etc.). Dehydration can also cause low blood pressure. But, you should know that it is quite normal to have lower blood pressure values in sitting or lying down position and higher values during physical activity or standing up position. As long as you don t have any symptoms like blurring vision, dizziness or lightheadedness, there is nothing to worry about. Hope to have clarified some of your uncertainties! Wishing good health, Dr. Iliri