What are the possible complications?

Uncontrolled or unresolved anger can lead to the following health problems:
Backache
Headaches
Hypertension (high blood pressure)
Insomnia
Irritable bowel syndrome, or other digestive disorders
Skin disorders
Stroke
Heart attack
Lower pain threshold
Weakened immune system, resulting in more infections, colds, and influenza.
Uncontrolled or unresolved anger can lead to emotional and mental problems, including:
Depression
Eating disorders
Alcohol abuse
Drug abuse
Self injury
Low self-esteem
Moodiness