1.Unwanted and disturbing thoughts, images, or urges (obsessions) that intrude into mind and cause a great deal of anxiety or discomfort
2.compulsions are performed in a ritualistic, or very specific way, for example, counting/ repeating three times before doing anything .
3.Cleaning compulsions (e.g., rituals and rules for how to wash hand, laundry, clean the bathroom, kitchen, etc.)
4.Checking : doors, locks, or backpacks, to make sure everything is safe.
5.Counting, tapping, touching, or rubbing (e.g., needing to touch a door four times before leaving a room).
6.Ordering/arranging items in specific ways, such as bed sheets, stuffed animals, or books in the school locker or book bag.
7.Mental rituals . Some perform rituals in their head, such as saying prayers or trying to replace a “bad” image or thought with a “good” image or thought.