The sickness you are referring to is called "Obsessive-Compulsive Disorder" (OCD). OCD is a mental health disorder characterized by unwanted, intrusive thoughts, images, or urges (obsessions) that lead to repetitive behaviors or mental acts (compulsions). People with OCD often feel compelled to perform these rituals or routines to alleviate anxiety or prevent perceived harm. However, these actions are usually excessive and not connected to any realistic threat. OCD can significantly interfere with daily life and requires appropriate treatment, such as cognitive-behavioral therapy (CBT) and/or medication, to manage symptoms effectively.