Obstructive sleep apnea induces a metabolic chain reaction that leads to increases in weight and blood sugar levels, among other unhealthy changes.

A dangerously high blood pressure reading for women is 180/120 mmHg or higher. Learn more about the health risks and when to seek emergency care.

Nighttime drops in ocean oxygen raise energy use in small reef fish. Repeated stress could affect reef health as oceans warm.

Subtle changes in how blood flows through the brain and how brain tissue uses oxygen may be closely linked to Alzheimer's ...