Suicide or simply self harm as a stress reliever. Cutting horizontally damages the vein wall but is mostly controllable while cutting vertically is harder to stop because of the extensive damage to the vein wall. (Please correct me if I’m wrong)
Yessssssssss you're to cut 'down the river (vertical) not across the road (horizontal) to be effective
Mental... also if this person really wanted to kill themselves why didn't the just go up to down?? Maybe it's a sign from them to other they need help
The like of pain would be inflected in other areas of the body not just one, majority of the time people who enjoy pain hide there scares in unnoticeable places like inner thighs... not places that are visable like all the way up ur arm
Sometimes people don't want to kill themselves. A lot of times, cutting us just a stress reliever, and not a suicide tactic.