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

https://innovativemen.com/health-conditions/mental-health/anger-management-in-vancouver-whats-really-behind-the-frustration/

Anger often 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 persistent sleep issues