Anger is rarely just about being mad. It is usually the result of long-term...

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

Anger is rarely just about being mad. It is usually the result of long-term pressure building up from work or home. You might notice it in a tight jaw, aching shoulders, or difficulty getting a good night's sleep