Marta, 52 years old, got up from bed in a hurry to answer the phone and felt everything spin for a few seconds. She held onto the wall, waited for it to pass, and went on with her day normally. The following week, the same thing happened three times, and this time it was accompanied by darkening of vision. That's when she decided to seek help.

This sensation of dizziness upon changing position is extremely common and, in most cases, does not represent anything serious. But there are signs that deserve medical attention. Understanding the difference is the first step towards caring for your health with peace of mind.

The data and clinical case cited in this article are fictitious and are purely illustrative in purpose, serving to facilitate understanding of the topic addressed.

Why does this happen?

When you lie down or sit for a while, blood tends to accumulate in the legs and abdomen due to gravity. When you stand up quickly, your body needs to adjust blood pressure and blood flow to the brain within seconds. This mechanism involves the autonomic nervous system, blood vessels, and the heart working together.

When this adjustment takes a bit longer than normal, so-called orthostatic hypotension occurs—a temporary drop in blood pressure when changing position. It is this drop that causes the sensation of dizziness, visual darkening, or a "lightheaded" feeling for a few seconds.

When this is considered normal

In most people, this type of dizziness is temporary and benign, especially when it happens:

  • When standing up very quickly, especially in the morning
  • After sitting or squatting for a long time
  • On very hot days or after drinking little water
  • After skipping meals or sleeping few hours
  • Lasts a few seconds and improves on its own, without other symptoms

These occasional, quick, and isolated episodes usually only reflect the time it takes for your body to rebalance circulation, without indicating any disease behind it.

Signs that deserve attention

There are situations in which dizziness upon standing should not be ignored. It is worth seeking medical evaluation when it is accompanied by:

  • Fainting or near-fainting (loss of consciousness)
  • Chest pain, palpitations, or sensation of rapid heartbeat
  • Shortness of breath
  • Sudden and very intense headache
  • Weakness or tingling on one side of the body, difficulty speaking or seeing
  • Episodes that repeat frequently throughout the week
  • Dizziness that lasts minutes and does not improve when sitting or lying down
  • Recent use of new medications, especially for high blood pressure, diabetes, or depression

These signs may indicate causes that require investigation, such as cardiac arrhythmias, more significant dehydration, anaemia, glucose alterations, medication side effects, or autonomic nervous system dysfunctions.

What to do to improve in everyday life

Some simple habit changes help considerably reduce these episodes:

Stand up in stages. When you wake up, sit on the bed for a few seconds before standing up, and only then begin to walk.

Take care of your hydration. Adequate water intake throughout the day contributes directly to circulating blood volume and blood pressure stability.

Avoid long periods of fasting. Eating regular meals helps maintain glucose levels and blood pressure more stable.

Pay attention to the hottest times of day. Intense heat promotes fluid loss and may intensify symptoms.

Review your medication use with your doctor. Some medicines for blood pressure, prostate, or mood can influence this mechanism, and dose or timing adjustments may make a difference.

If the episodes persist despite these precautions, or if any of the warning signs are present, the best option is to speak with a doctor to investigate the cause more thoroughly.

How telemedicine can help

A telemedicine consultation is an accessible way to begin this investigation. In it, it is possible to review your health history, the medications in use, the frequency and characteristics of the episodes, and determine together with you whether additional tests are necessary, such as blood pressure evaluation, blood tests, or cardiac follow-up. This initial guidance already helps to understand whether the case requires only simple routine adjustments or a more in-depth investigation.

This content is educational and informative in nature, not replacing individualised medical consultation, diagnosis, or treatment. Each case should be evaluated by a health professional.

Dr Rebeca Soares Andrade CRM-GO 39335