NAMI HelpLine

Symptoms of PTSD typically emerge within three months of experiencing or being exposed to a traumatic event. However, in some cases, symptoms may not surface until years later. A diagnosis of PTSD requires a thorough evaluation with a trained professional. According to the National Center for PTSD, PTSD symptoms generally fall into these four categories:

  • Re-experiencing the traumatic event (also called intrusion), such as flashbacks, nightmares, or intrusive memories
  • Avoidance of reminders related to the trauma, including people, places, or conversations
  • Negative changes in mood and cognition, including emotional numbness, detachment from others, or difficulty experiencing positive emotions
  • Hyperarousal (also known as being “keyed up”), which involves symptoms like irritability, difficulty sleeping, trouble concentrating, and heightened startle response

Young children can also develop PTSD, and some of the symptoms are different from those of adults. Young children generally lack the ability to verbally express some aspects of their experience. Their behavior (such as clinging to parents) is often a better indicator of how they are doing than their words. Some children experience changes in their developmental trajectory, including slipping back into earlier behaviors (for example, a 4-year-old may begin having toileting accidents after having successfully completed potty training).

It is essential that a child be assessed by a professional who is skilled in the developmental responses to stressful events. A pediatrician or child mental health clinician can be a good start.

Reviewed and updated May 2025

NAMI HelpLine is available M-F, 10 a.m. – 10 p.m. ET. Call 800-950-6264,
text “NAMI” to 62640, or email. In a crisis, call or text 988 (24/7).