A blood pressure reading below 90/60 mmHg is generally considered low. That means the top number (systolic) is under 90, the bottom number (diastolic) is under 60, or both. Unlike high blood pressure, though, there’s no single cutoff that applies to everyone. The 2025 AHA/ACC guidelines define normal blood pressure as below 120/80 mmHg but don’t set a universal threshold for “too low.” What matters most is whether a low reading comes with symptoms.
What the Numbers Mean
Blood pressure is recorded as two numbers. The top number, systolic pressure, measures the force in your arteries when your heart beats. The bottom number, diastolic pressure, measures that force between beats, when your heart is resting. A reading of 110/70, for example, is perfectly healthy. A reading of 85/55 is technically low, but if you feel fine, it may simply be your normal baseline.
Some people, particularly younger adults, athletes, and people with smaller frames, walk around with readings in the low 90s or even 80s systolic and feel completely normal. Low blood pressure only becomes a medical issue when it causes noticeable symptoms or drops suddenly from where it usually sits.
Symptoms That Signal a Problem
A low number on its own isn’t necessarily a concern. The symptoms that accompany it are what separate “naturally low” from “problematically low.” Watch for dizziness or lightheadedness, blurred vision, nausea, fatigue that doesn’t improve with rest, difficulty concentrating, or fainting. If you experience these alongside a reading below 90/60, your body is telling you it’s not getting enough blood flow to keep up with demand.
Cold, clammy skin, rapid shallow breathing, and confusion can indicate a more serious drop, sometimes related to severe dehydration, blood loss, or infection. These warrant urgent medical attention.
Drops When You Stand Up
One of the most common forms of low blood pressure happens the moment you get up from sitting or lying down. This is called orthostatic hypotension, and it’s defined as a systolic drop of 20 mmHg or more, or a diastolic drop of 10 mmHg or more, within three minutes of standing. So if your blood pressure is 130/85 while lying down and falls to 105/72 when you stand, that qualifies.
For people who already have high blood pressure while lying flat, the threshold is even steeper: a systolic drop of 30 mmHg or more. Orthostatic hypotension affects an estimated 7% to 10% of adults being treated for high blood pressure, and it’s especially common in older adults. That brief wave of dizziness when you stand too quickly is often this mechanism at work.
Drops After Eating
Blood pressure can also fall significantly after meals, a pattern known as postprandial hypotension. This typically involves a systolic drop of about 20 mmHg within two hours of eating. It happens because your body diverts a large volume of blood to your digestive system, and in some people, the cardiovascular system doesn’t compensate quickly enough. Older adults are most affected, and large, carbohydrate-heavy meals tend to trigger bigger drops.
Medications That Lower Blood Pressure
If you’re on medication for high blood pressure, a reading that dips below 90/60 may be a sign your dose needs adjusting. All classes of blood pressure drugs can push readings too low, including diuretics (water pills), beta blockers, and alpha blockers. Parkinson’s disease medications can also cause significant drops. Even drugs not designed to affect blood pressure, like certain antidepressants and medications for erectile dysfunction, can contribute.
If you notice new dizziness or fatigue after starting or changing a medication, checking your blood pressure at home can help you and your provider figure out whether the dose is responsible.
Low Blood Pressure During Pregnancy
Blood pressure naturally dips during the first and second trimesters of pregnancy as the circulatory system expands rapidly. Normal blood pressure in pregnancy is 120/80 or lower, and it’s common for readings to fall well below that baseline in early pregnancy before rising again in the third trimester. Mild dizziness during this period is typical, especially when standing quickly or after hot showers.
Pregnancy blood pressure monitoring tends to focus more on high readings. A reading of 140/90 or above after 20 weeks is considered high, and anything over 160/110 is a medical emergency. But if your readings are consistently very low and accompanied by fainting or extreme fatigue, it’s worth mentioning to your provider.
Managing Chronically Low Readings
If your blood pressure runs low and causes symptoms, a few practical strategies can make a real difference. Increasing salt intake is one of the most effective approaches because sodium helps your body retain fluid, which raises blood volume. A general recommendation for people with chronic low blood pressure is 3 to 5 grams of salt per day, though the right amount varies from person to person.
Fluid intake matters just as much. Aiming for 60 to 100 ounces of water daily (roughly 8 to 12 cups) helps maintain the blood volume your cardiovascular system needs to keep pressure stable. These two changes work together: increasing salt without enough fluid won’t help much, and vice versa.
Other practical measures include standing up slowly, especially first thing in the morning. Eating smaller, more frequent meals can reduce post-meal drops. Compression stockings help prevent blood from pooling in your legs. And if you notice symptoms mostly in the morning, drinking a full glass of water before getting out of bed can give your system a head start.