Low blood pressure (hypotension) means the force of blood pushing against your artery walls is lower than your usual or than the typical range, often defined as below about 90/60 mmHg in adults. For some people this is normal and harmless, but for others it can cause symptoms like dizziness or fainting because the brain and other organs may not get enough blood.

What “low blood pressure” means

  • Blood pressure is written as two numbers, like 120/80, where the top (systolic) is pressure when the heart beats and the bottom (diastolic) is pressure when it relaxes.
  • Many clinicians use “less than 90/60 mmHg” as a rough threshold for low blood pressure in adults, but what’s “too low” depends on your usual readings and whether you have symptoms.
  • Low blood pressure becomes more concerning when it is new, sudden, or significantly lower than your normal, especially if you feel unwell.

Common symptoms you might notice

Low blood pressure may cause no symptoms at all, or it can make you feel quite bad.

  • Dizziness or feeling lightheaded, especially when standing up.
  • Fainting or feeling like you are going to pass out.
  • Blurred vision, trouble concentrating, or feeling “spaced out”.
  • Fatigue, weakness, or feeling unusually tired.
  • Nausea, cold or clammy skin, rapid shallow breathing, or a weak, fast pulse in more serious situations.

If you ever have chest pain, severe shortness of breath, confusion, or signs of shock (pale, cold, very weak, barely responsive), that is an emergency and needs urgent medical care.

Why someone might have low blood pressure

Low blood pressure can be harmless, but it can also signal another problem, so context matters.

Some frequent causes include:

  • Dehydration (not drinking enough, vomiting, diarrhea, heavy sweating), which reduces blood volume.
  • Blood loss from injury, surgery, or internal bleeding, which can cause a sudden dangerous drop.
  • Certain medications such as drugs for high blood pressure, some heart medicines, antidepressants, or Parkinson’s drugs.
  • Heart problems that weaken the heart’s pumping ability, such as heart failure, heart attack, or abnormal heart rhythms.
  • Hormonal or metabolic issues, like adrenal gland problems or severe infections (sepsis).
  • Standing up quickly or standing for long periods (orthostatic or postural hypotension), especially in older adults or those with nervous system conditions.

Some young, healthy people—especially athletes—naturally have lower readings without any health issue, and for them it may actually reflect good cardiovascular fitness.

When it’s okay vs. when to worry

Low blood pressure is not automatically dangerous; how you feel and what else is happening in your body are crucial.

Generally:

  • Often less concerning if:
    • You have always run on the low side.
* You feel completely fine (no dizziness, fainting, or other symptoms).

* Your readings are stable and your doctor is not worried.
  • More worrying if:
    • Your pressure suddenly drops compared with your normal.
* You have symptoms like fainting, confusion, shortness of breath, chest pain, or a fast weak pulse.

* You have another serious condition (heart disease, severe infection, major injury) at the same time.

In those situations, low blood pressure can mean the body is not getting enough blood flow, and organs like the brain, heart, and kidneys may be at risk.

What to do if your blood pressure is low

Only a clinician who knows your health history can tell you what low readings mean for you, but there are some typical steps.

  • Seek urgent care or emergency help if you have severe symptoms (fainting, confusion, chest pain, severe shortness of breath, signs of shock).
  • For milder, occasional symptoms, a doctor will usually:
    • Review your usual blood pressure range and recent changes.
* Check your medications, fluid intake, and any recent illnesses, injuries, or infections.

* Examine you and possibly order blood tests, ECG, or other tests depending on your situation.

Depending on the cause, management might include drinking more fluids, adjusting medicines, wearing compression stockings, changing how you stand up, or treating an underlying heart, hormone, or infection problem.

Information gathered from public forums or data available on the internet and portrayed here.