(HealthDay News) -- Obsessive compulsive disorder (OCD) is an illness that causes people to obsess over daily activities. While everyone has daily habits and behaviors, when they interfere with daily life, it's a possible warning sign of OCD.

The American Academy of Family Physicians lists these potential examples of OCD:

• Obsessing over whether things are done in order or correctly, in an exact fashion.
• Being unusually afraid of dirt or germs, and as a result, repeatedly engaging in activities such as washing the hands or showering.
• Constantly and repeatedly checking on a situation, such as making sure the home's doors are locked or appliances are shut off.
• Thinking about specific sounds, images, words or numbers repeatedly.
• Seeking constant reassurance or approval.