Unexplained fainting deserves follow-up, even when an initial evaluation does not identify a cause. Fatigue, reduced exercise tolerance, palpitations, and near-fainting can overlap with heart or lung concerns. Share the full pattern with your healthcare provider rather than trying to interpret symptoms on your own.

What fainting means

Syncope is a brief loss of consciousness. It can have different causes, so a single episode should not be used to diagnose a heart or lung condition.

What one conference case can, and can’t, tell us

A case presented at the ATS 2025 conference described an 84-year-old woman whose initial neurologic evaluation after fainting did not identify a cause. A later pacemaker check detected a serious heart rhythm problem. The authors discussed pulmonary hypertension and rhythm concerns, while noting that more research is needed. This was one case report, not a guideline or a way to determine what is causing anyone else’s symptoms. Read the abstract by Bhattarai and Karki.

Make your next conversation more useful

• Write down when fainting or near-fainting happened and what you were doing.
• Note any palpitations, fatigue, breathing changes, or reduced exercise tolerance around the same time.
• Share the timeline and any relevant medical-device information with your healthcare provider.
• Contact your provider about unexplained fainting. Seek emergency help for fainting with chest pain, severe breathing difficulty, serious injury, or failure to recover promptly.

If you’re concerned about symptoms, contact your own healthcare provider. The Fatigue Clinic does not diagnose or treat pulmonary hypertension or arrhythmias. For support with a broader history of long-standing fatigue, call 901-221-8621. The clinic is located in Collierville and serves Germantown, Memphis, Arlington, and surrounding areas. For 16 years, our focus has been helping people organize a complex health story. You finally have time to tell us the whole story. Learn more about The Fatigue Clinic and browse Client Resources. People searching for a holistic provider in Memphis TN can use that search as a starting point while discussing symptoms with their own healthcare provider.

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This content is for general educational purposes only and is not intended to diagnose, treat, cure, or prevent any medical condition. It is not a substitute for individual medical advice; always consult your own healthcare provider about your health and before making any changes to your care. Statements about herbal products have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease.