Blood pressure is one of the most important factors your body has to get blood to your entire body. Any problem with either too high or too low blood pressure should be taken seriously. I would recommend seeing your primary care physician.
In general, chronic low blood pressure does not cause fatigue. If someone's blood pressure drops suddenly (because of an infection or because of a heart problem or because of dehydration, etc) then one can feel tired, lightheaded and sick. This is a serious, ICU level condition. If you blood pressure has recently decreased suddenly--seek immediate medical attention.
Chronically low blood pressure more likely would result lightheadedness or dizziness or the sensation of nearly fainting.
That being said, some medicine that lowers blood pressure can cause fatigue. These include beta blockers such as atenolol or metoprolol.
Regardless, low blood pressure is a concern. You should discuss this with your doctor
. If you are on any blood pressure medications--these may need to be adjusted.
Fatigue in general can have many causes that increase with age. Some of the more common conditions include anemia
(low blood count), hypothyroidim (low thyroid hormone--the "energy hormone"), sleep problems (such as sleep apnea, related with snoring
), or even depression. Discuss this with your doctor.
Talk with your doctor. Both your blood pressure and your fatigue are important issues to work up.