A hot bath or soak does not necessarily raise your blood pressure. The relaxation will lower your blood pressure.

I suggest you get a home blood pressure kit. You can buy them for $20 to $30 at a drug store like Walgreens. Everyone should know how to track their blood pressure. If you get a head ache, you can check your blood pressure to see if it is high and contributing to your head ache.

Blood pressure is only a problem when it stays high or has very high spikes.

Hope this answers your question.