Hypoxemia: What are the causes?
What causes hypoxemia?
- No name / No state given
Mayo Clinic pulmonologist Edward Rosenow, M.D., and colleagues answer select questions from readers.
Answer
Hypoxemia, or low blood oxygen, isn't a disease but a sign of an underlying problem. It can have many causes, including:
- High altitudes
- Chronic obstructive pulmonary disease (COPD)
- Pulmonary fibrosis
- Blood clot in the lungs (pulmonary embolism)
- Severe pneumonia
- Fluid in the lungs (pulmonary edema)
- Congenital heart disease
The main symptom of hypoxemia is shortness of breath. Blood oxygen content can be measured by a blood test or by a pulse oximeter, a small device that's clipped on your finger like a clothespin.
Severe hypoxemia can be life-threatening. Treatment of hypoxemia depends on the underlying cause.


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