Skip to Content

Symptom Checker

Step 4: Read and complete the decision guide to learn more about your symptoms.

Blacking Out, Fainting, or Loss of Consciousness

Always worrisome. Even if this was a simple faint, you should notify your doctor. The next black out could cause even worse injury.

Lightheadedness is often caused by more than one factor. And if blood pressure drops quickly, you can pass out.

Many medications cause lightheadedness with standing. Even if a medication is not the primary cause, it may be a significant contributor.

Types of medications that most often cause postural hypotension (a drop in blood pressure due to a change in body position) and lightheadedness with standing include:

- Blood pressure medicines

- Beta blockers

- Calcium channel blockers

- Diuretics (water pills)

- Nitroglycerin and other nitrates

- Tricyclic antidepressants

Do you take any of the above medications?

Yes, I take one or more of these medications.

No, I don't take any of these.

Disclaimer: This content should not be considered complete and should not be used in place of a call or visit to a health professional. Use of this content is subject to specific Terms of Use & Medical Disclaimers.