Anxiety and post-traumatic stress have followed Tia Christiansen, 53, years after the shooting at a Las Vegas music festival left dozens dead. 

Christiansen was in a hotel room at Mandalay Bay Resort and Casino in 2017 when a gunman killed 58 people and left hundreds injured. She recalled the loudness and intensity of the gunfire of 1,000 bullets that she heard from just two rooms down from the gunman, who fired from the window into the crowd.

“Some days, it’s so top of mind and it’s so overwhelming that it’s difficult to get out of bed, and some days it’s not possible for me to get anything done at all,” Christiansen said, who was uninjured in the shooting. “Not even something as simple as the dishes. It’s just too much.”

Every time there’s a mass shooting across the nation, it intensifies Christiansen’s fear of being caught in another one. 

“It brings it all back in a very palpable way,” Christiansen said. “My body hurts. A lot of my PTSD symptoms come back 100-fold. It makes it feel like all the progress that has been made can disappear in a moment or a day.”

Research shows that the mental health toll of mass shootings extends far beyond survivors and witnesses. Mass shootings were reported as the most common source of stress among U.S. adults, according to an August 2019 survey conducted by the American Psychological Association. 

The 71% stress rate was higher than stress from health care that year at 69%. And nearly one third of the U.S. population feared they could not go out in public without the chance of a mass shooting, according to the survey.