Harm OCD is a subtype of obsessive-compulsive disorder characterized by unwanted, intrusive thoughts, images, or urges about causing harm to oneself or others. These thoughts are ego-dystonic, meaning they are deeply inconsistent with the person's values, intentions, and character.

Common fears include:

• "What if I lose control and hurt someone?"

• "What if I accidentally harmed someone without realizing it?"

• "What if having these thoughts means I'm dangerous?"

People with Harm OCD often respond with compulsions such as avoiding knives or sharp objects, seeking reassurance, mentally reviewing past events, checking for evidence that no harm occurred, or avoiding loved ones out of fear of acting on intrusive thoughts.

The distress comes not from a desire to harm others, but from the uncertainty surrounding the thoughts themselves.

Contamination OCD involves persistent fears of becoming contaminated by germs, illness, chemicals, bodily fluids, or other substances.

For some people, contamination fears also extend to emotional contamination—the fear that contact with certain people, places, objects, or experiences can transfer unwanted emotions, traits, memories, or a sense of "badness."

Common fears include:

• "What if I become sick or make someone else sick?"

• "What if this object is contaminated?"

• "What if touching this person or place changes who I am?"

• "What if this item now feels permanently 'tainted' or 'wrong'?"

Compulsions often include excessive handwashing, cleaning, showering, disinfecting, changing clothes, avoiding people or places, throwing away possessions, or seeking reassurance that something is safe or "clean enough."

Individuals with emotional contamination may repeatedly wash, replace belongings, avoid reminders of certain people or events, or perform rituals to restore a feeling of internal cleanliness or "rightness."

Although these behaviors may provide temporary relief, they reinforce OCD over time and keep the cycle going.

Responsibility OCD is characterized by an inflated sense of personal responsibility for preventing harm, mistakes, or negative outcomes. Individuals with this subtype often believe they must be absolutely certain they have done everything possible to keep themselves and others safe, even when the likelihood of harm is extremely small.

Unlike Harm OCD, which centers on fears of intentionally or impulsively causing harm, Responsibility OCD centers on fears of accidentally causing harm—or failing to prevent it—through one's actions, omissions, or mistakes.

Common fears include:

• "What if I accidentally caused someone to get hurt?"

• "What if I forgot something important and something terrible happens?"

• "What if I could have prevented this?"

• "What if I'm responsible for a mistake I don't remember making?"

Compulsions may include excessive checking, reviewing memories, seeking reassurance, confessing, asking others for certainty, repeatedly verifying tasks, researching, or mentally trying to prove that no harm occurred. Some people avoid making decisions altogether for fear of making the "wrong" choice or causing unintended consequences.

While these behaviors may temporarily reduce anxiety, they ultimately strengthen OCD by reinforcing the belief that complete certainty and perfect responsibility are necessary.

Scrupulosity OCD is a subtype of obsessive-compulsive disorder characterized by intrusive doubts and fears related to religion, spirituality, or morality. Individuals with scrupulosity often worry that they have sinned, offended God, violated their religious beliefs, or failed to live according to their spiritual values, despite having no objective evidence that they have done so.

Unlike Morality OCD, which centers on secular concerns about ethics and being a "good" person, Scrupulosity OCD focuses on religious or spiritual beliefs, practices, and one's relationship with God or a higher power.

Common fears include:

• "What if I committed a sin without realizing it?"

• "What if my prayers weren't sincere or said correctly?"

• "What if God is angry with me?"

• "What if I'm not truly faithful or will be punished for making a mistake?"

Compulsions may include excessive praying, repeatedly confessing, seeking reassurance from religious leaders or loved ones, mentally reviewing thoughts or intentions, rereading religious texts, or avoiding situations that trigger fears of sin or blasphemy.

Although these behaviors may provide temporary relief, they strengthen OCD by reinforcing the need for certainty about one's faith, intentions, or salvation.

Morality OCD is characterized by persistent doubts about whether one is a "good" or moral person. Individuals with this subtype often become preoccupied with making the right ethical choices, avoiding wrongdoing, or ensuring they have not violated their personal values, even in situations where there is no objective evidence that they have done anything wrong.

Unlike Scrupulosity OCD, which centers on religious or spiritual fears, Morality OCD focuses on secular concerns about ethics, character, fairness, honesty, and doing the "right" thing.

Common fears include:

• "What if I'm actually a bad person?"

• "What if I acted selfishly or unfairly?"

• "What if I lied without realizing it?"

• "What if I made the wrong ethical decision?"

Compulsions may include mentally reviewing past actions, seeking reassurance from others, confessing perceived mistakes, researching ethical questions, repeatedly apologizing, or analyzing one's intentions to gain certainty about being a "good" person.

Although these behaviors may provide temporary relief, they reinforce OCD by increasing the need for certainty about one's morality and character.

Health & Somatic OCD is characterized by persistent fears about one's physical health, bodily sensations, or the possibility of having or developing a serious illness.

Individuals with this subtype often become preoccupied with normal bodily sensations, searching for signs of disease, or trying to achieve certainty that they are healthy.

Unlike general health anxiety, the distress in Health & Somatic OCD is maintained by obsessive doubts and repetitive compulsive behaviors aimed at obtaining certainty or reducing anxiety.

Common fears include:

• "What if this symptom is a sign of a serious illness?"

• "What if the doctors missed something?"

• "What if I stop noticing my breathing or heartbeat?"

• "What if this sensation means something is terribly wrong?"

Compulsions may include repeatedly checking the body for changes, monitoring physical sensations, researching symptoms online, seeking reassurance from loved ones or healthcare providers, requesting repeated medical testing, comparing symptoms with others, or mentally analyzing bodily sensations to determine whether they are "normal."

Although these behaviors may provide temporary relief, they reinforce OCD by increasing attention to uncertainty and bodily sensations.

Existential OCD is a form of obsessive-compulsive disorder characterized by intrusive, unwanted questions about existence, reality, consciousness, identity, or the meaning of life.

While many people occasionally reflect on these topics, individuals with Existential OCD often feel trapped in repetitive doubt and mental analysis, searching for certainty about questions that cannot be answered with complete confidence.

Common obsessions may include questions such as":

“What if none of this is real?"

How do I know I exist?"

"What if life has no meaning?"

Compulsions often involve rumination, compulsive Googling, reassurance seeking, reading philosophy or neuroscience in search of answers, or mentally reviewing the same questions over and over.

Treatment for Existential OCD typically involves Exposure and Response Prevention (ERP), often combined with Acceptance and Commitment Therapy (ACT).

Rather than trying to eliminate philosophical questions, therapy helps you develop a different relationship with uncertainty so that you can stop OCD from dictating your life and only choose to become a philosopher if you want to.

"Just Right" OCD is characterized by a persistent feeling that something is incomplete, off, or not "just right." Rather than being driven by a specific feared consequence, individuals with this subtype experience an intense internal sense of discomfort, incompleteness, or wrongness that compels them to repeat behaviors until things feel correct.

Unlike other forms of OCD that are driven by fears of harm or catastrophe, "Just Right" OCD is primarily driven by the need to relieve an uncomfortable feeling of imperfection or incompleteness.

Common experiences include:

• "It doesn't feel right yet."

• "I need to do it one more time until it feels correct."

• "Something feels off, even though I can't explain why."

• "I can't move on until this feels complete."

Compulsions may include repeating actions, arranging or aligning objects, rereading or rewriting, retracing steps, touching objects a certain number of times, repeating movements, or restarting tasks until they feel "right."

Some individuals also experience mental rituals, such as repeating words or reviewing thoughts until they achieve a sense of completeness.

Although these behaviors may temporarily relieve the feeling of wrongness, they reinforce OCD by increasing the need to achieve an elusive sense of certainty or completeness.