Anger usually acts as a pressure valve for stress you haven't been able to...

https://www.coast-bookmarks.win/anger-is-often-just-the-pressure-of-unspoken-stress-building-up-you-might-feel

Anger usually acts as a pressure valve for stress you haven't been able to release. When you carry the weight of work or home life, it shows up as a tight jaw, knotted shoulders, or broken sleep