What Is a Dangerously Low Blood Pressure Number?

According to the AHA, there is no specific number at which day-to-day blood pressure is considered too low. However, when low blood pressure is accompanied by any of the above listed dangerous symptoms, it is time to seek medical care.

When Low Blood Pressure Can Strike

Some people have naturally low blood pressure, and they don't experience any symptoms. But for those who are used to having high blood pressure, a sudden decrease in blood pressure can signal a problem and can cause the symptoms listed above. An episode of hypotension is more likely to occur under these conditions:

• Resuming an upright posture after bed rest for a long period of time
• Being in the first 24 weeks of pregnancy
• Losing a large amount of blood
• Being dehydrated.
• Taking certain medications, such as blood-pressure-lowering medications, heart medications, Parkinson's disease medications, tricyclic antidepressants, or medications to treat erectile dysfunction
• Having a heart problem, such as a very slow heartbeat, heart valve problems, heart attack, or heart failure
• Having a endocrine problem, such as hypothyroidism, parathyroid disease, Addison's disease (an adrenal gland disorder), low blood sugar, or diabetes
• Having a severe infection that enters your bloodstream
• Experiencing anaphylaxis, a life-threatening allergic reaction
• Having a neural disorder that affects your blood pressure
• Having a nutrient deficiency, such as low vitamin B12 and folic acid levels

Can Low Blood Pressure Make You Tired?

Low blood pressure can cause fatigue — that feeling of overwhelming tiredness and lack of energy. Research has found an association between low blood pressure and chronic fatigue syndrome, a condition characterized by profound fatigue, pain, and sleep abnormalities that are often made worse by exertion. There is no cure for this type of fatigue, but doctors may suggest treating underlying causes, such as sleep disorders or mental health issues. Treating low blood pressure with dietary changes and proper physical activity can also help.

When Do You Need Medical Care for Hypotension?

If your blood pressure is always on the low side and you do not have any of the dangerous symptoms, there is usually no cause for concern. Similarly, if you have a single at-home blood pressure reading that is abnormally low without any symptoms, you probably do not need to see your doctor. It is normal for your blood pressure to rise and fall over time, and your body is usually able to get your blood pressure back to normal. But, says Dr. Lawrence, “when you sense there’s a recurrent problem, or there’s no clear explanation for what’s happened, you need to seek medical advice." If your blood pressure drops suddenly and you are experiencing symptoms like dizziness, you should call your healthcare provider. They can assess your situation and rule out underlying problems, such as internal bleeding, serious infection, or an allergic reaction. Treatment for hypotension will depend on the cause of the low blood pressure. Immediate steps might include the following:

• Lying with your feet above your heart
• Drinking fluids
• Avoiding hypotension triggers like prolonged standing

After evaluation, a doctor may make these recommendations:

• Avoid alcohol.
• Adjust your diet.
• Adjust your medications (possibly lowering dosages of blood-pressure-lowering drugs).
• Take blood-pressure-raising medications, suchas Florinef (fludrocortisone) and ProAmatine (midodrine).
• Wear compression stockings.

People who experience shock related to hypotension will need emergency treatment to restore blood flow to their organs and raise their blood pressure back to normal. Keep track of your blood pressure readings, even if you don’t have any health issues, so that you know what your personal normal reading is. And if your blood pressure is being monitored, talk to your doctor about the blood pressure target range that’s best for you.

Frequently Asked Questions