<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi my dads blood pressure is at 200100. we have already taken him to the hospital but they released him because they cannot control it. what should i do. why is it high? the blood work looked normal. they said they did not know why. could it be a clot?  <response>: Hello! Welcome and thank you for asking on Chat Doctor! These blood pressure values are really high, and they impose your father to a high risk for intracranial bleeding. For this reason, if he has motor deficits or gait troubles, I would recommend performing a brain CT scan. From the other hand it is important performing further tests to investigate for the possible cause of these blood pressure spikes: - thyroid hormone levels for thyroid dysfunction- cortisone and aldosterone plasma levels for a Chat Doctor. You should discuss with his doctor on the above issues. If no possible cause is found, I would recommend making some changes to his antihypertensive therapy increase the doses or add on new 