If you're going in for a doctor's appointment, checking blood pressure is often a routine part. They can tell you through a test if you have high or low blood pressure and what to do about it. However, there are other symptoms of high or low blood pressure you can identify yourself like dizziness, lightheadedness, vision problems, or a pounding in the chest. If you feel like you could have a blood pressure issue, it's important to get your levels checked.