Answer:
obsessive-compulsive disorder
Step-by-step explanation:
Obsessive-compulsive disorder, popularly known by the acronym OCD, is a psychiatric anxiety disorder characterized by obsessive and intrusive thoughts. The condition also causes compulsive and repetitive behaviors, which are commonly related to cleanliness and organization.
Doctors are not yet able to fully understand what is behind obsessive-compulsive disorder, but the main theories surrounding the causes of OCD concern three factors: biology, genetics and the environment.
Some researchers believe that OCD may be the result of changes in the person's body or brain. These people often have deficiency in the neurotransmitters norepinephrine and serotonin, dysfunctions in areas of the brain associated with the fight or flight response, frontal lobes and caudate nucleus, similar to what happens with Willian.