As a 44-year-old mom of three, Stacy couldn’t afford to have any more migraines than she already did. Since headaches are a potential side effect of the COVID-19 vaccine, she was hesitant to get the shot. “I was originally afraid of the side effects,” Stacy says. “I was worried it was going to make my migraines worse.” She’s not alone. In March 2021, Carnegie Mellon University published a survey showing that 70 percent of participants were concerned about COVID-19 vaccine side effects.