A character is repeatedly physically abused. She can spend seen being kicked and punched a few times.
Another character is struck in the head and killed. His body is shown three times, and blood can be seen. This can be especially disturbing.
A character gets into a drunken bar fight. Punches are exchanged and blood is visible.
We see another character's body on the floor with blood seeeping. He is presumably dead.
Season 5 - bloody war violence, beatings, gun shots directly to heads, etc.
The first 4 seasons are not very violent. Seasons 5-6 are the most violent.
The pilot kicks off with a shooting. A character self-harms with a knife, another character is slapped by her father. One of the women deals with domestic violence; we see her being struck as well as the wounds afterward. More than one murder occurs, and we see the bloody aftermath of an apparent shooting.
A woman struggling with gender confusion is tortured in a mental hospital (brief but upsetting scene).
A man beats and kicks a pregnant woman, resulting in a miscarriage.
A woman is kidnapped, strapped to a table for a forced abortion, and attempts to escape but falls off a ledge.