Low blood pressure can cause light-headedness, blacking out of the vision or a faint feeling when you stand up. Some people have naturally low blood pressure and feel fine, but symptoms should not be ignored when they are new or strong.
Why it happens#
When you stand up, blood briefly pools in the legs. The body normally corrects that quickly. If the correction is slow, you can feel dizzy or unsteady.
Dehydration, fever, diarrhea, vomiting, hot weather, alcohol and some medicines can all make this worse.
What helps right away#
Sit or lie down if you feel dizzy, then stand up slowly. Drink water if dehydration may be part of the problem. A light snack can help if it has been a long time since the last meal.
If the problem happens in the morning, sit on the edge of the bed for a moment before standing. Gentle leg movement helps the circulation get going.
When it may be something else#
If the dizziness is spinning rather than light-headed, an inner ear problem may be involved. If there is chest pain, shortness of breath, palpitations, fainting or neurological symptoms, it is not a simple low blood pressure problem.
When to seek care#
Seek care quickly if dizziness comes with fainting, chest pain, shortness of breath, confusion, one-sided weakness, slurred speech, or a severe headache. Also seek review if symptoms started after a new medicine or keep happening often.
Further reading and sources#
Further reading: