What causes dizziness when you stand up or bend down?

Orthostatic hypotension

Orthostatic hypotension is a condition in which blood pressure drops when a person stands up from a sitting or lying position. This can cause dizziness, lightheadedness, and even fainting. Orthostatic hypotension is often caused by dehydration, certain medications, or underlying medical conditions such as diabetes or Parkinson's disease.

When you stand up from a sitting or lying position, gravity causes blood to pool in your legs and feet. This can lead to a decrease in blood pressure and a drop in blood flow to your brain. This can cause dizziness, lightheadedness, and even fainting.

Vasovagal syncope

Vasovagal syncope is another common cause of dizziness when standing up or bending down. Vasovagal syncope occurs when the vagus nerve, which controls heart rate and blood pressure, is stimulated. This can be caused by a number of factors, such as stress, anxiety, dehydration, or sudden changes in blood pressure.

When you experience vasovagal syncope, your heart rate and blood pressure will drop suddenly, which can cause dizziness, lightheadedness, and fainting. You may also experience sweating, nausea, and vomiting.

Other causes

In some cases, dizziness when standing up or bending down can be caused by other medical conditions, such as:

* Anemia

* Heart disease

* Lung disease

* Neurological disorders

If you experience dizziness when standing up or bending down, it is important to see a doctor to rule out any underlying medical conditions.