On Thursday, the national nonprofit Screening for Mental Health Inc. will hold Post-Traumatic Stress Disorder Screening Day.

The initiative is an outreach, education and screening program to raise awareness about PTSD.

Thousands of colleges, community-based organizations and military installations will be hosting a screening program.

Members of the public are urged to visit PTSDScreening.org to take a self-assessment online and to learn more about the condition.

Sometimes traumatic events, such as the Jan. 8, 2011, shootings in Tucson, affect an entire community.

In other instances, traumatic events can affect a single individual.

Symptoms of PTSD often include reliving the event through nightmares and flashbacks; avoiding situations that are reminders of the event such as large crowds or driving a car; developing negative changes in beliefs or feelings; and feeling hyper-alert or easily startled.

Read more health briefs in Monday's Arizona Daily Star