Pigs eating human food in the first few minutes is a pretty gross scene.
A character is injured about halfway through the film. While in a frenzied state, he moves to multiple locations, many blood splatters ranging from mild to large are seen across walls and floors, along with mild blood seeping from his mouth. The prolonged scene is upwards of 10 minutes.
No-Face at one point goes on a rampage and eats people, but they are later spat out and revealed to be unharmed. He also vomits violently at different points, and is greedy and gluttonous.
A stink monster is made of dirty substances. When Sen (Chihiro) rips a fishing rod's lure & hook out of the monster, blood and mucus pour out of the hole along with a lot of other garbage. Not easy to eat while watching.