# Medical causes and diagnosis of shortness of breath

> Live situation record from CLSTR: https://clstr.news/situations/medical-causes-and-diagnosis-of-shortness-of-breath
> Updated: 2026-08-22T08:55:00.000Z. Sources: 7. Developments: 2.

Medical discussions regarding shortness of breath, or dyspnea, highlight that the symptom can persist even when standard diagnostic tests like chest X-rays, CT scans, and echocardiograms return normal results. This often occurs because routine tests are conducted while a patient is at rest, potentially missing issues that only manifest during physical exertion or increased metabolic demand.

Potential causes for breathlessness include both cardiac and non-cardiac factors. Non-cardiac causes may involve asthma, chronic lung conditions, respiratory infections, anemia, obesity, or reduced physical conditioning. Cardiovascular causes can include issues with heart muscle, valves, rhythm, or the heart’s ability to pump and fill with blood.

Specialists, such as Dr. Murat Yüzüak, note that diagnostic indicators include the onset of symptoms and their relationship to physical exertion or sleeping positions. For example, orthopnea—difficulty breathing when lying flat that improves when sitting up—is a typical sign of heart failure, though it is not a definitive confirmation. To reach an accurate diagnosis, medical professionals utilize tools such as blood gas measurements, pulmonary function tests, and a review of medical history to differentiate between lung disease, heart conditions, or other systemic problems.

## Claims

- Shortness of breath can be a symptom of heart disease, lung disease, or anemia. (corroborated by 4 sources)
- Orthopnea, where shortness of breath increases when lying flat and improves when sitting up, is a typical sign of heart failure. (corroborated by 4 sources)
- Chest X-rays can help evaluate heart size, pneumonia, lung masses, pleural fluid, pneumothorax, and COPD. (corroborated by 4 sources)
- Blood gas measurements provide vital information for patients suspected of respiratory failure. (corroborated by 2 sources)

## Timeline

### 2026-08-22: Shortness of breath may indicate heart or lung disease

Pulmonary specialist Dr. Murat Yüzüak warns that shortness of breath can signal heart disease, lung issues, or anemia, emphasizing the importance of diagnostic tools like X-rays and blood gas tests.

5 sources. https://clstr.news/cluster/shortness-of-breath-may-indicate-heart-or-lung-disease

### 2026-08-18: Causes of shortness of breath with normal heart and lung tests

Shortness of breath can occur despite normal heart and lung tests, as some issues only appear during exertion or specific postures. Causes range from respiratory issues to cardiovascular conditions.

2 sources. https://clstr.news/cluster/causes-of-shortness-of-breath-with-normal-heart-and-lung-tests

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Cite as: Medical causes and diagnosis of shortness of breath. CLSTR, https://clstr.news/situations/medical-causes-and-diagnosis-of-shortness-of-breath