Here's a therapist's article about bipolar rage:

https://www.mentalhelp.net/articles/...der-and-anger/

Title of article: The Link Between Bipolar Disorder and Anger

There is a lot of information here at this link.

by Buck Black, LCSW

<snip> A person's beliefs, use of alcohol and other drugs, or a combination of past emotional hurts may be at the root of anger. However, some people have anger that is based in imbalances in brain chemistry, instead of emotions or drugs introduced into the body.

....

<snip> A significant portion of people with bipolar disorder also have moderate to high levels of anger.