Last August, LAMB OF GOD guitarist Mark Morton shared a warning on social media about the band’s live performances that may trigger fans with PTSD and epilepsy.

“As a band, we have always strived to put on the best show possible for our fans,” he wrote on social media. “We know that tickets are not cheap and we do not take it lightly that you are spending money that you worked hard for to come see us play. As LAMB OF GOD has grown in popularity, we’ve invested more and more into our production. As of late, this has included pyro, flash bombs and concussion bombs.

“We are aware that many of our fans have served in the armed forces and that some unfortunately experience combat-related PTSD,” Morton continued. “The purpose of this post is to acknowledge you… and to give you a proper heads up so that you can at least be aware coming in that we will be using those effects. Strobe lights too, by the way.

“If you’re reading this and someone you know should know this before coming to the show, please spread the word. We love y’all… and want you to have a great time. Thanks for being with us.”

Flashing light effects that have become the norm at various music concerts could bring on epileptic seizures in people who may not know they have a vulnerability.

Epilepsy triggered by flashing lights is called photosensitive epilepsy. For people with photosensitive epilepsy, exposure to flickering or flashing lights and patterns can trigger electrical disturbances in the brain.

Signs of possible epileptic seizure included loss of consciousness, muscle twitching, tongue biting and urinary incontinence.