Answer:
Some mental illnesses developed from bad mental health can cause violence. The effect of many drugs can cause violence.
Step-by-step explanation:
E.g:
Intermittent explosive disorder involves repeated, sudden episodes of impulsive, aggressive, violent behavior or angry verbal outbursts in which you react grossly out of proportion to the situation.
Cocaine, heroin, marijuana, and amphetamines are examples of drugs classified to have abuse potential. Drugs are also related to crime through the effects they have on the user's behavior and by generating violence.