There are a few quite graphic bloody images.
Many brutal beatings that results in people being injured but not killed. The violence in this film is tame, especially from a Nicholas Winding Refn movie.
Several instances of Bronson fighting/attacking authorities or prison guards. Most of the time there is no blood, and only one instance where he bites a mans neck, nothing too graphic is shown
We sometimes see Bronson's heavily bloodied face after he has received a beating from the prison guards for attacking them.
A patient at a mental institution defecates in his hand and wipes some of the excrement on his face. He seems bewildered.
Bronson refuses medication in a mental institution and is then attacked by orderlies and injected with drugs against his will. An ill and incoherent Bronson is seen in the following scene, during which he spits in another man's face. The man insinuates he has hurt a young girl.
After punching a man around in a fight, it's implied that Bronson urinates on him.
Bronson attempts to strangle a pedophile in a mental institution with a neck tie.
Bronson takes a prison teacher hostage, paints his face, ties him to a flag, and uses an apple as a gag.