The Pentagon has decided that it will not award the Purple Heart, the hallowed medal given to those wounded or killed by enemy action, to war veterans who suffer from post-traumatic stress disorder because it is not a physical wound.

The decision, made public on Tuesday, for now ends the hope of Iraq and Afghanistan veterans who have the condition and believed that the Purple Hearts could honor their sacrifice and help remove some of the stigma associated with the condition.

The disorder, which may go unrecognized for months or years, can include recurring nightmares, uncontrolled rage and, sometimes, severe depression and suicide. Soldiers grappling with PTSD are often unable to hold down jobs.

In May, Defense Secretary Robert M. Gates said awarding Purple Hearts to such service members was “clearly something that needs to be looked at,” after he toured a mental health center at Fort Bliss, Tex.