Is anger a sign of depression?

My friend is 28 years old. He has anger issues. I think he is also depressed. Is anger a sign of depression?

Could be one, but not diagnostic. Chronic anger suggest other issues and can be dangerous. Please see a counselor.

Sometimes it may be some patients have agitated depression.

Not necessarily. Go see a therapist for a one time thing to find out

See this link.
https://www.healthline.com/health/depression/depression-and-anger