Low Blood Pressure (Hypotension): Causes, Symptoms, and When to Worry

When blood pressure is too low for you, the brain is the first organ to complain. Typical symptoms:

• Dizziness or light-headedness, especially on standing up
• Blurred or narrowing vision ("graying out")
• Fainting (syncope) or feeling about to faint
• Fatigue, poor concentration, feeling "foggy"
• Nausea, clammy or pale skin

The pattern matters as much as the number. A steady 88/58 with no symptoms is a very different situation from a drop of 20+ mmHg every time you stand — the latter is called orthostatic (postural) hypotension and is worth investigating, particularly in older adults, where it raises fall risk.

Most low readings trace back to one of these:

• Dehydration — the most common everyday cause; heat, exercise, illness, and simply not drinking enough all shrink blood volume.
• Medications — blood pressure drugs (especially if the dose overshoots), diuretics, some antidepressants, Parkinson's drugs, and erectile dysfunction medicines.
• Standing up quickly — gravity pools blood in the legs; ageing reflexes compensate more slowly.
• After meals — blood diverts to digestion; postprandial dips are common in older adults.
• Pregnancy — pressure typically runs lower, especially mid-pregnancy.
• Heart, endocrine, and neurological conditions — arrhythmias, thyroid problems, adrenal insufficiency, and autonomic disorders can all lower pressure.
• Sudden severe hypotension — from major blood loss, serious infection (sepsis), or severe allergic reaction (anaphylaxis) — is a medical emergency with shock symptoms: confusion, rapid weak pulse, cold clammy skin.

Make an appointment if:

• You faint, or you repeatedly feel faint on standing
• Symptoms are new, worsening, or interfering with daily life
• Low readings started after a medication change — bring your readings log, as a dose adjustment is often the fix
• Low blood pressure comes with chest pain, breathlessness, an irregular heartbeat, or black/tarry stools

Seek emergency care for signs of shock: cold clammy skin, rapid shallow breathing, a weak fast pulse, confusion.

If you're symptom-free at 88/56, mention it at your next routine visit — it's very likely just your normal. Knowing your baseline is what makes changes meaningful; home tracking a few times a week builds that baseline.

For everyday, symptom-level hypotension, doctors commonly suggest:

• Drink more fluids, especially in heat and around exercise.
• Stand up in stages — sit on the edge of the bed for a moment before rising; tense your leg muscles as you stand.
• Eat smaller, more frequent meals if you dip after eating; consider less alcohol, which dilates vessels.
• Compression stockings can help with pooling in the legs.
• Salt — unlike in hypertension, a doctor may deliberately suggest more salt for symptomatic hypotension. Don't self-prescribe this if you have heart or kidney conditions; ask first.

Track readings alongside symptoms — noting when the dizziness happens and what the monitor said — so patterns like post-meal dips or a medication timing effect become visible. That's precisely the record a doctor needs to help you.