Breakthrough. It sounds good. It even sounds like something everyone should support. The problem, however, comes when people are asked to define breakthrough. There is almost always a slight pause ...

Scientists said Wednesday they have developed the world's tiniest pacemaker, a temporary heartbeat regulator smaller than a ...

As measles spreads across the U.S., a few fully vaccinated people have contracted rare breakthrough cases. Here's what to ...

Breakthrough bleeding refers to any unscheduled bleeding during your menstrual cycle. It’s typically a small amount of spotting, though some experience heavier bleeding. Breakthrough bleeding is ...