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Obsessive-compulsive disorder (OCD) is a type of mental health condition that causes repeated unwanted thoughts. To get rid of the

Oxygen saturation refers to the amount of oxygen being carried in the red blood cells, which load up with oxygen in the lungs and

Oophoritis is inflammation of an ovary (or ovaries), which occurs most often as a complication of an infection of the reproductive

An outbreak of an illness occurs when there is an increase in the number of people who live in the same area and are infected

Oxygen therapy means using an oxygen tank or a machine to breathe in air that contains more oxygen than normal. Oxygen therapy

Partial pressure is the pressure that one gas exerts in a mixture of gases or in a fluid. Partial pressure results are usually

A pacemaker is a small, battery-powered device that sends out small electrical impulses to make the heart muscle contract

A pathogen is a living organism that causes disease. Pathogens include bacteria, viruses, fungi, and protozoa.

An epileptic seizure is the body and brain's response to sudden bursts of abnormal electrical activity in the brain. A focal

Oligoarticular juvenile idiopathic arthritis (JIA), also known as oligoarthritis, is the most common and often the mildest type of