According to the Manhattan Center for Cognitive Behavior Therapy, compulsive behaviors that may be symptoms of OCD include rearranging things until they feel just right, counting the number of people you pass on the street, and repeatedly checking the door to make sure it's locked. Of course, it's important to remember that only a psychologist can provide a definitive diagnosis, so if you think that you or someone in your life may have OCD, schedule an appointment to be assessed by a professional.

Per the Manhattan Center for Cognitive Behavior Therapy, pretty much everyone engages in impulsive behaviors at times. Examples include spending a lot of money on something you can't necessarily afford, eating comfort food, drinking alcohol when you didn't plan on it, or yelling at someone in a moment of anger.

The center notes that certain impulsive behaviors are often fairly harmless and they aren't linked to a specific disorder. However, it's important to know that repeatedly engaging in impulsive behaviors, especially ones that are harmful to you or others, can be a symptom of bipolar disorder or schizophrenia, per Nature. Only a professional can properly diagnose a mental illness if one is present.