Low blood pressure and fatigue are often linked together. That is, if you are fatigued, you may have low blood pressure. Likewise, low blood pressure can cause fatigue. If you are experiencing low blood pressure and/or fatigue, you should have your doctor check it out to see if there is an underlying medical condition.
Low blood pressure can lead to fatigue and is of serious medical concern. Fatigue from low blood pressure is an outward symptom of internal problems related to your cardiovascular system and it should be assessed by a qualified medical provider.
Low blood pressure or hypotension is defined by a blood pressure of less than 90/60 mm/HG. Each number (Systolic--top number) and Diastolic (bottom number) are read seperately. That is a systolic of 90 or below is considered low and a diastolic of 60 or below is considred low.
If you start feeling fatigued and sluggish, it is a good idea to see how your blood pressure is doing. There are many places to check your blood pressure like a pharmacy, doctor's office, or with home equipment.
Fatigue caused by low blood pressure can indicate a serious health condition like: allergies, disease, overdose of medication, heart or vessel problems, heat exhaustion, infection or even pregnancy. It is critical to get low blood pressure and fatigue examined by your doctor.
On their website the Mayo Clinic advises blood pressure can vary greatly "depending on body position, breathing rhythm, stress level, physical condition, medications you take, what you eat and drink, and even time of day".