Hypoxemic refers to a condition where there is a deficiency of oxygen in the blood. This can occur due to various reasons, such as high altitudes, respiratory diseases, or issues with the heart. When the body does not receive enough oxygen, it can lead to symptoms like shortness of breath, confusion, and fatigue. In medical settings, hypoxemia is often measured using a device called a pulse oximeter, which estimates the oxygen saturation level in the blood. Treatment may involve supplemental oxygen or addressing the underlying cause, such as improving lung function or enhancing blood circulation.