PHILADELPHIA (CBS) – If all of the talk of the 10th anniversary of 9-11 leaves you feeling a little blue, it’s all part of the process, according to an expert on grief.

No one is immune to grief and loss, but this is a special case. Janine Mariscotti, a social work assistant professor at LaSalle University, says there’s a difference between what we all experienced after the attacks and the burdens we carry after, say, a family member dies.

“People who have experienced complicated grief and what happened on 9-11 certainly qualifies as a complicated loss because of the massive loss of life, the unpredictability of it, you know, that we didn’t know. It was sudden. It was traumatic.”

Even things like marking the anniversary may knock some people back a step or two. It’ll be okay, says Professor Mariscotti. These emotional aftershocks are rarely as long-lasting as the original.

Reported by John Ostapkovich, KYW Newsradio