An obsession is the inability of a person to stop thinking about a particular topic or feeling a certain emotion without a high amount of anxiety. When obsessed, an individual continues the obsession in order to avoid the consequent anxiety. In the case of obsessive compulsive disorder (OCD), the individual may have only the obsessions, compulsions or both. An example of an obsession in OCD is a person who can't stop thinking about dirt or germs that they could come into contact with. In this case, thinking about the dirt and/or germs is the obsession.