Each line of a blood pressure log should include the date, time, blood pressure reading and notes about special circumstances, advises About.com contributor Dr. Craig Weber. Keeping a log makes it easier to identify daily trends and determine how certain activities affect blood pressure.
The notes section of a blood pressure log should include information about anything that could cause elevated readings, says Dr. Weber. For example, some medications can increase blood pressure shortly after taking them. It is also important to write down any symptoms experienced just before taking a blood pressure reading. Shortness of breath, severe headaches, nosebleeds and severe anxiety are all signs of dangerously high blood pressure levels, according to the American Heart Association.