Researchers now suggest that the human brain goes through five distinct phases of development over the course of a lifetime.

The trachea is also known as the windpipe. Tracheal deviation, or tracheal displacement, is when the trachea shifts from its usual position in the neck and chest to one side. It is a symptom rather ...

A collapsed trachea occurs when the cartilage in your throat becomes softer and begins to fall inward. You may be born with it, or it may develop because of a condition, treatment, or injury. A ...