But how do you know if it's just a simple faint or something more serious? Dr. Elijah Behr, a cardiologist at Mayo Clinic ...

Conor Doherty weighed just five-and-a-half stone and would regularly lose consciousness during his teenage years ...

Postural Orthostatic Tachycardia Syndrome (POTS) is a disorder that causes dizziness and other symptoms due to reduced blood ...