People usually don't think of exercise as a bad thing. After all, regular physical activity is an important part of a healthy lifestyle. But too much of it, as with anything, can be harmful.

She is running. Sweat is dripping down her face. Her eyes linger on the numbers lit up on the treadmill. Pain is shooting through her leg. She thinks that she might have strained or pulled something ...

This informational guide, part of POPSUGAR's Condition Center, lays out the realities of this condition: what it is, what it can look like, and strategies that medical experts say are proven to help.

Eating disorders are defined by the American Psychiatric Association as “a behavioral cognition characterized by severe and persistent disturbance in eating behaviors and associated distressing ...