The protagonist says his father had a violent temper and would throw things at him. The abuse itself isn't shown on screen, but his scars from his father are shown.
The protagonist holds a woman down after he attacks her when she comes over to visit. During this, he tortures her (though that's shown very briefly) then kills her.
The film is about tinnitus, but the protagonist describes how specific sounds affect it. The film is also heavily audio-focused, featuring frequencies and static noises as well as other amplified sounds.
The protagonist becomes violent at the end. He's not specifically diagnosed with a mental illness, but he seems to be delusional. And the way he describes his "tinnitus" (reacting to things like life and death) makes it seem like the sounds are potentially auditory hallucinations.
There's no actual birth, but the male protagonist describes a dream where he became pregnant and cut the baby out of his stomach in his eagerness to "become a mother".