Anger often acts as a pressure gauge for stress you’ve been carrying at work or...

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

Anger often acts as a pressure gauge for stress you’ve been carrying at work or home. It shows up physically when you notice a clenched jaw or tight shoulders during the day, or when your sleep starts to suffer