A dangerously low oxygen level—usually below 92%—can cause shortness of breath, confusion, chest pain, or fainting. It’s often triggered by lung or heart conditions like COPD, asthma, or heart ...

If someone’s blood oxygen level falls below 60 mm Hg, there may not be enough oxygen reaching the body’s vital organs. This can lead to symptoms such as shortness of breath and dizziness. This article ...

The reason why obstructive sleep apnea makes you tired is because it causes you to wake frequently throughout the night, preventing restful sleep.

A recent study explored one possible cause -- hyperoxia or high concentrations of oxygen given to such patients during surgery -- as opposed to doses more similar to air. The study concluded that ...

Sleep apnea and low oxygen levels while sleeping are associated with epilepsy that first occurs after 60 years of age, known as late-onset epilepsy, according to a new study funded by the National ...