Article updated and reviewed by Michael S. Lehrer, MD, Clinical Assistant Professor, Department of Dermatology, University of Pennsylvania on April 18, 2005.
Each hair grows in cycles—it grows, rests, and then falls out. Usually, this cycle repeats approximately yearly. At any time, about ninety percent of a person's scalp hair is growing, a phase that lasts between two and six years. Ten percent of the scalp hair is in a resting phase that lasts between two and three months. At the end of its...
Fall is settling in, and that familiar autumnal nip of cool air pushes through our hair as we rake unruly leaves or knock door to door on... Read more »
The middle of summer is often a good time for those who have outdoor seasonal allergy problems. In the upper half of the U.S., tree and... Read more »