When you get angry, your heart rate, arterial tension and testosterone production increases, cortisol (the stress hormone) decreases, and the left hemisphere of your brain becomes more stimulated.
Researchers induced anger in 30 men "Anger Induction" (AI), which consists of 50 phrases in first person that reflect daily situations that provoke anger.
Before and immediately after the inducement of anger, the researchers measured heart rate and arterial tension, levels of testosterone and cortisol, and the asymmetric activation of the brain.
According to Eurekalert:
"The results ... reveal that anger provokes profound changes in the state of mind of the subjects ('they felt angered and had a more negative state of mind') and in different psychobiological parameters."