Orthostatic hypotension risk factors

The body has to shift blood pressure quickly when a person stands. Fluid loss from sweating, fever, vomiting, or diarrhoea can leave less circulating volume. Heat and standing still encourage blood to collect in the legs. Recovery after bed rest can make upright activity harder at first. Blood-pressure medicines, water tablets, and some medicines for mood or sleep may also contribute. Heavy menstrual bleeding, low food intake, anaemia, heart problems, and disorders affecting the nervous system may be relevant in some people. A risk factor is a clue, not a diagnosis.

Drink regularly when appropriate for your health, eat consistent meals, and take breaks from hot rooms or long periods of standing. Rise slowly, move the calf muscles before walking, and sit down as soon as light-headedness begins. Review every medicine and supplement with a clinician rather than stopping anything yourself. Note when symptoms occur, what preceded them, whether there was fainting, and how quickly recovery happened. Arrange a GP consultation if symptoms are recurrent, worsening, or limiting ordinary activities.

Get urgent medical help for fainting during exercise, chest pain, severe breathlessness, a new irregular heartbeat, confusion, a serious fall, or symptoms that remain severe after lying down. Prompt assessment is appropriate for repeated fainting, fainting without warning, marked bleeding, ongoing fluid loss, or inability to keep drinks down. These patterns may need more than simple trigger avoidance and should be assessed in context.

Which risk factor fits my symptom pattern? Could a medicine, menstrual bleeding, recent illness, or low intake be involved? Do I need blood pressure checks in different positions or other tests? What precautions should I take with work, school, or exercise?