Actually probably nothing. You have to have REALLY low blood pressure before people get worried. And remember everybody is different so are you saying low blood pressure for you meaning you have kept track of your baseline to see how you normally run?

One problem that is quite common is low volume. So simple dehydration can cause low blood pressure. Try drinking more water.

If your truly worried go to the doctor and see if you have an actual problem.

Good Luck! And be safe!
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If you have no symptoms and are otherwise healthy, low blood pressure is better than high blood pressure and needs no treatment. Occasional low blood pressure is common and can result from dehydration, standing up too quickly, or eating a large meal.; treatment in these cases would consist of fluids, standing up more slowly, and eating smaller meals, respectively. In rare cases, low blood pressure can be a sign of potentially serious medical conditions, so see your doctor if you have persistent and symptomatic low blood pressure or have any worries about it.
Source(s):
http://www.mayoclinic.com/health/low-blood-pressure/DS00590

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As said you could have low blood volume. Make sure your hydrated.
The better health your in the lower your blood pressure, but too low can be dangerous. What is your blood pressure at?

120/80 is normal and mine is at about 90/60
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Normal blood pressure has a systolic between 90 and 135 (the top number), and a diastolic between 50 and 90 (the bottom number). Anything out of this range should be evaluated by a doctor. If you are currently experiencing symptoms, I would go to the ER immediately. Low blood pressure can result from conditions of the nervous system, conditions that do not begin in the nervous system, and drugs. Neurologic conditions that can lead to low blood pressure include changing position from lying to more vertical (postural hypotension), stroke, shock, lightheadedness after urinating or defecating, Parkinson's disease, neuropathy and simply fright. Nonneurologic conditions that can cause low blood pressure include bleeding, infections, dehydration, heart disease, adrenal insufficiency, pregnancy, prolonged bed rest, poisoning, toxic shock syndrome, and blood transfusion reactions. It can cause symptoms such as dizziness or lightheadedness, nausea, fatigue, weakness, and blurred vision. Treatment depends on the cause. You can read more here
http://www.womenfitness.net/hypotension.htm
Source(s):
I am a nurse for over 23 years

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