Natalia Ragozina, Miss Sledgehammer, World Champion In WIBF Heavyweight Boxing

In addition, the corner is responsible for stopping the fight if they feel their fighter is in grave danger of permanent injury. The corner will occasionally throw in a white towel to signify a boxer's surrender (the idiomatic phrase "to throw in the towel", meaning to give up, derives from this practice). This can be seen in the fight between Diego Corrales and Floyd Mayweather. In that fight, Corrales' corner surrendered despite Corrales' steadfast refusal.
Medical concerns
Knocking a person unconscious or even causing concussion may cause permanent brain damage. There is no clear division between the force required to knock a person out and the force likely to kill a person. Since 1980, more than 200 amateur boxers, professional boxers and Toughman fighters have died as the result of ring or training injuries. Thus, in 1983, the Journal of the American Medical Association called for a ban on boxing. The editor, Dr. George Lundberg, called boxing an "obscenity" that "should not be sanctioned by any civilized society." Since then, the British, Canadian and Australian Medical Associations also have called for bans on boxing.