Contamination OCD: What It Is, How It Shows Up, and How It’s Treated

Contamination OCD is one of the more common OCD subtypes we see in our office. Whether it shows up on its own or alongside other subtypes, many of the OCD clients we work with are experiencing it now or have experienced it at some point in the past.

What Is Contamination OCD?

Like other subtypes, contamination OCD looks a little different from person to person. The specific details vary, but the overall theme and pattern are often very similar: an excessive fear of things that are “dirty.”

What counts as dirty depends on the individual and their specific OCD thoughts. Often there’s a sense that certain things must be avoided because they are dirty or potentially contaminating. When contact does happen, mental or physical rituals follow to make things clean again or keep the contamination from setting in.

Common “Dirty” Things

Some of the most common include:

• Shoes
• Countertops, bathrooms, toilets, and sinks
• Doorknobs, handles, rails, and anything publicly shared
• Money
• Certain types of meat, especially raw chicken, pork, and other poultry (often more so than beef or fish), due to fears of getting sick from bad food

How the OCD Mind “Tracks” Contamination

A common pattern in contamination OCD is that the mind keeps track of contamination, or perceived contamination. If someone touches something their brain has deemed dirty, their hands now feel dirty, and they need to keep them separate from everything else. If they don’t, whatever their hand touches becomes dirty too. The brain keeps a running record of it all until some cleaning or “resetting” process makes things clean again.

This isn’t a small sense of dirtiness. It feels urgent and important that things be cleaned, sanitized, or washed, and it stays at the forefront of the mind until that’s done, which can be highly disruptive and distressing.

Common Rituals and Behaviors

People with contamination OCD often develop rituals to avoid public or dirty things, or find covert ways of touching them, like using the back of a hand or a sleeve pulled down. Other frequent behaviors include:

• Repeated handwashing, or washing for a long time until things feel clean again
• Frequently wiping things down
• Cooking with gloves on
• Changing clothes frequently
• Shower or bathing rituals
• Rigid rules about where things go in the home and what things can and can’t touch each other
• Throwing things away very quickly
• Avoiding certain foods, places, going out, or public restrooms
• Elaborate processes for using public things, controlling how they’re touched or how clean they are
• Avoiding physical contact, or only allowing closeness with a small group of “safe” people
• Frustration when others don’t share the same concerns

The Toll It Takes

These rituals can have physical consequences: hands may become dry, cracked, and even start to bleed. Their rigidity can also strain relationships, especially in a home where not everyone feels the same urgency about avoiding certain things or certain contaminations.

When the Fear Is About Other People

Sometimes contamination OCD centers on other people. For example, someone might fear that peanut residue on their hands will spread to a person with a peanut allergy, and that they’ll be responsible for that person getting sick, or at worst, dying.

The OCD mind often makes a quick leap to the extreme: If I touch something dirty, something terrible will happen. Terrible can mean getting fatally sick, or even worse, spreading it to their kids, parents, grandparents, or some innocent person who didn’t have a say in the matter. Then comes the fear of responsibility: I’ll have to live with this forever, knowing I could have avoided it if I had just washed a little more. That thought, that it all could have been prevented with one more ritual, gets stuck and really eats at people.

This is the process of OCD: an urgent sense that you have to do this, or else, where the “or else” is far more extreme than someone without OCD would imagine. People with OCD often recognize that these thoughts don’t match what they really believe, but the feeling is so strong that it seems impossible to ignore.

Other Common Contamination Fears

Other common contamination worries include:

• Food and illness: getting sick, not cooking food well, or making the people you serve sick
• Transmissible illnesses: AIDS and rabies are very common, along with other types of viruses
• Bugs and parasites: tapeworms, lice, ticks, or anything that feels like it could infect the body

Visible or spilled blood can certainly trigger these fears, but it isn’t a prerequisite. Simply interacting with public things, passing a needle on the street, or seeing an old Band-Aid can set off the thoughts. The brain makes quick connections: Maybe someone touched this, then I touched it, and somehow it got inside me. Now I’m doomed, or someone I love is.

Reasonable Cleanliness vs. OCD

Contamination OCD can be tricky to parse out, because there is a reasonable level of cleanliness that anyone, with or without OCD, wants to maintain to stay healthy. Washing your hands before eating after touching a lot of public things, or after touching bodily fluids or the bottom of your shoes, is very reasonable, even wise, in the right context.

So in therapy, we spend time figuring out what a reasonable reaction to potential contamination looks like for each person, and where obsessional doubt comes into play. That’s the point where a safety precaution becomes more about resolving obsessional distress than about cleanliness or safety. Through talking and reflecting together, clients develop the awareness to tell the difference between what’s my OCD and what’s just a reasonable level of safety.

How Contamination OCD Is Treated

Exposure and Response Prevention (ERP)

Contamination OCD responds really well to exposure and response prevention therapy. There are many different ways to design and practice exposures, making it a very accessible subtype for exposure work.

Some clients worry they’ll have to face their most feared thing right away. That’s not how exposure therapy works. We always build a scale together and work up it at your willingness and pace, moving up and down as needed. Exposures are collaborative and designed so you feel confident you can achieve them, while also feeling confident you’ll be challenged. You’ll never be flooded on purpose or asked to do something that goes against your values or is too intimidating for where you are with your OCD.

Acceptance and Commitment Therapy (ACT)

Along with ERP, we often incorporate elements of acceptance and commitment therapy to build distress tolerance and acceptance skills. That means learning that things can be distressing without always being dangerous, and that we can survive distressing feelings, often more than we think we can. People tend to underestimate their ability to manage distress, and discovering that capacity is a powerful part of treatment.

Inference-Based Cognitive Behavioral Therapy (I-CBT)

Contamination OCD also responds to inference-based cognitive behavioral therapy, which involves less direct exposure work. If exposures feel too intense or intimidating right now, I-CBT is a great option.

I-CBT explores the thought patterns behind OCD and aims to restore trust in your senses and your own wisdom. You’ve lived a lot of life, made many good decisions about safety, and navigated and survived plenty of problems. I-CBT helps you trust that wisdom and intuition about when, and when not, to respond to a threat, rather than trusting the urgency and excessive doubt that OCD creates.