There are many types of obsessive-compulsive disorder. They are characterized by obsessive thoughts, compulsive (uncontrollable) behaviors, or a combination of both.
The individual has unwanted thoughts but no associated outward behaviors. Thoughts are usually sexual, violent or otherwise taboo in nature. The person may engage in mental compulsions, such as prayer, to find relief. Some people may be obsessively worried about their sexual orientation and seek constant reassurance or avoid others altogethers.
Individuals hoard items without value under the belief they "may be needed someday."
The obsessive fear of "being bad" leads to ongoing feelings of generalized guilt and the reciting of prayers, seeking forgiveness, or engaging in religious rituals.
People with this form of OCD arrange objects in order to gain a feeling of control. Magical thinking can be associated with this form of OCD.
This form of OCD features the excessive checking of doors, stoves, appliances, etc. or constant reassurance from others. These people are obsessed with the idea they will accidentally "burn the house down," make a mistake, or offend someone. Driving, especially at night, may be avoided for fear of hitting a person or animal.
People with this form of OCD are afraid they will get sick or otherwise experience harm by touching surfaces such as door knobs and bed sheets or by touching others (such as handshaking). These fears lead to excessive hand-washing or bathing, avoiding touching others, or wearing gloves and masks.