A blood pressure reading below 90/60 mmHg is considered low. For many people, especially younger adults and those who are physically active, low blood pressure causes no symptoms and is perfectly normal. It only becomes a concern when it drops enough to reduce blood flow to your organs, causing dizziness, fainting, or fatigue.
Whether your low reading is harmless or worth investigating depends on how you feel, how quickly it dropped, and what’s causing it.
What Counts as Low Blood Pressure
Normal blood pressure for most adults is below 120/80 mmHg. Low blood pressure, or hypotension, starts at readings below 90/60 mmHg. But those numbers alone don’t tell the whole story. Someone who normally runs 100/65 may feel fine at that level, while someone whose pressure recently dropped from 130/85 to 95/60 could feel terrible. The change from your baseline matters as much as the absolute number.
The 2025 blood pressure guidelines from the American Heart Association don’t set a firm lower cutoff for dangerous hypotension, because the threshold varies from person to person. What matters most is whether the low reading comes with symptoms.
Symptoms That Signal a Problem
Low blood pressure without symptoms rarely needs treatment. When pressure drops low enough to affect blood flow to your brain and organs, you’ll typically notice lightheadedness or dizziness, blurred vision, difficulty concentrating, nausea, or unusual fatigue. Some people feel unsteady on their feet or notice they’re unusually cold.
More serious drops can cause fainting. If you faint and recover quickly, that’s worth discussing with a doctor but isn’t usually an emergency on its own. However, if someone with low blood pressure develops cool and clammy skin, a rapid or weak pulse, rapid shallow breathing, confusion, or a bluish tinge to the lips or fingernails, that can indicate shock, which is a medical emergency requiring immediate help.
Common Causes
Dehydration is the most frequent and most fixable cause. When you haven’t had enough fluids, your blood volume drops and so does your pressure. Illness with vomiting or diarrhea, heavy sweating, and simply not drinking enough water can all trigger it.
Nutritional deficiencies play a role too. Low levels of vitamin B-12, folate, or iron can prevent your body from making enough red blood cells, a condition called anemia. Fewer red blood cells means less oxygen delivery and lower pressure.
Pregnancy commonly causes low blood pressure, especially during the first and second trimesters, because the circulatory system expands rapidly. Prolonged bed rest can also lower pressure because the body loses its ability to adjust to position changes. Certain nervous system conditions, including Parkinson’s disease, can impair the automatic systems that regulate blood pressure.
Medications are another major cause. Blood pressure drugs, diuretics (water pills), alpha blockers, and beta blockers can all push pressure too low, especially if doses are too high or if you become dehydrated while taking them.
Orthostatic Hypotension: Drops When You Stand
If your blood pressure drops mainly when you stand up, that’s orthostatic hypotension. It’s diagnosed when your systolic pressure (the top number) falls by 20 mmHg or more, or your diastolic (bottom number) falls by 10 mmHg or more, within three minutes of standing. If you already have high blood pressure while lying down, the threshold is a 30 mmHg systolic drop.
This type is especially common in older adults. The classic experience is standing up from a chair or getting out of bed and feeling a rush of dizziness or seeing spots. It happens because the blood vessels in your legs don’t tighten quickly enough to push blood back up to your brain. Standing up slowly, pausing at the edge of the bed before getting to your feet, and staying well hydrated all help.
Postprandial Hypotension: Drops After Eating
Some people experience a significant blood pressure drop after meals, typically within 30 to 60 minutes of eating, though it can happen up to two hours later. Normally your heart rate increases after a meal and blood vessels elsewhere in your body tighten to compensate for the blood being redirected to your digestive system. When that compensating mechanism doesn’t work well enough, pressure falls.
This is more common in older adults and people with nervous system conditions. Eating smaller, more frequent meals and limiting high-carbohydrate foods can reduce the drop.
Fainting From a Nerve Reflex
The “common faint,” known medically as vasovagal syncope, is the most frequent cause of fainting in younger adults. It happens when a nerve reflex causes your blood vessels to suddenly widen and your heart rate to slow, sending your blood pressure plummeting. Triggers include prolonged standing, emotional stress, pain, dehydration, being in a warm and crowded environment, and nausea or vomiting.
You’ll often get warning signs: feeling warm, sweaty, nauseous, or lightheaded in the seconds before you faint. If you recognize these signals and sit or lie down immediately, you can usually prevent a full faint. These episodes are frightening but typically not dangerous on their own. If they happen repeatedly, a doctor may recommend a tilt table test, where you lie on a table that slowly tilts you upright while monitors track your heart rate and blood pressure over 5 to 45 minutes. This helps pinpoint whether a nerve reflex is responsible.
What You Can Do About It
If your low blood pressure is causing symptoms, a few practical changes can make a real difference.
- Increase fluids. Aim for at least 60 to 100 ounces of fluid daily. Water is the foundation, but drinks with electrolytes can help if you’re sweating or recovering from illness.
- Add salt. Unlike people with high blood pressure who need to limit sodium, people with symptomatic low pressure often benefit from more. A general recommendation is 3 to 5 grams of salt per day, though the right amount varies. You can add salt to meals or use salt tablets, starting with one tablet daily and gradually increasing.
- Wear compression stockings. Waist-high compression stockings rated at 20 to 30 mmHg or 30 to 40 mmHg help prevent blood from pooling in your legs. Knee-high versions are easier to tolerate but less effective.
- Change positions slowly. When getting out of bed, sit on the edge for 30 seconds before standing. When rising from a chair, pause before walking.
- Eat smaller meals. Large meals divert more blood to digestion. Smaller, more frequent meals reduce postprandial drops.
If a medication is causing your low pressure, your doctor may adjust the dose or switch to a different drug. This is especially common with blood pressure medications, where the goal is to lower pressure but not too much. Never stop a prescribed medication on your own, but do mention your symptoms so the dose can be reevaluated.
When Low Blood Pressure Is Actually Good
For many people, consistently low blood pressure with no symptoms is a sign of cardiovascular fitness, not a medical problem. Athletes and people who exercise regularly often have resting pressures in the low range. A reading of 95/62 in someone who feels energetic and alert is nothing to worry about. The number on the cuff only matters in the context of how your body is functioning.