Anger is not a mental health disorder as such. In most cases, it is a fairly normal human emotion that everyone experiences occasionally.

Each person has a different way of managing their anger.
Problematic anger may be a sign of several psychiatric disorders e.g. Oppositional Defiance Disorder, Post Traumatic Stress Disorder, and Major Depressive Disorder.
People who experience persistent, intense anger or who have difficulty regulating their anger can experience significant psychological distress and functional impairment. Anger causes more destruction to an individual’s interpersonal relationships than any other emotion.

A referral for psychological treatment is recommended. CBT, or Cognitive Behavioural Therapy is moderately effective for the treatment of problematic
anger in young people.

References:

Evidence Summary: Understanding and assessing anger-related difficulties in young people – a guide for clinicians https://headspace.org.au/assets/Uploads/OR17177-EvidenceSummary-Anger-WEB.pdf