Fear of Self-harm
Asides from the intense fear of hurting others, OCD patients are also afraid of hurting themselves. This disorder causes them to run back and forth, trying to avoid any situation for such to happen. That the person regularly experiences fear and graphic thoughts of self-harm or suicide may be unknown to those around the patient.
However, you should pay attention when a friend or family member is constantly and obsessively checking to prevent harmful scenarios. For example, he/she keeps rearranging the knives or running to the kitchen to check the gas switch.