Four weeks after the bombings at the Boston Marathon, life for many in the city has regained a sense of normalcy. But for some — particularly victims, their caregivers, and others who witnessed the blasts — life may still be a struggle.

Those, who are still facing overwhelming fear and take pains to avoid the site of the April 15 bombings, could be suffering from post-traumatic stress disorder, mental health experts say.

They may see images of smoke, bloody victims, and frantic crowds flashing in front of them unbidden while riding the T or walking to work. Or they could be drinking coffee with a friend when a loud truck honk triggers a surge of panic. Full story for BostonGlobe.com subscribers.

Deborah Kotz can be reached at dkotz@globe.com. Follow her on Twitter @debkotz2.

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