Atrial fibrillation (AF) is a common form of heart arrhythmia, a serious condition in which the heart beats so fast that its upper chambers, the atria, quiver. This irregular heartbeat can increase ...

The signs of a dangerous blood clot can vary depending on its location. Some people may also not experience any symptoms.

Best Dance Songs of All Time: 100 classic dance music songs, from house to techno to electronic to dubstep to disco to ...