If your child checks the front door ten times before leaving the house, rewrites their homework until it feels “perfect”, or washes their hands until they are sore, it can be easy to think they simply need reassurance or encouragement to stop.
Unfortunately, OCD (Obsessive Compulsive Disorder) is rarely that simple.
OCD is a complex condition involving the brain, the body, emotions, thinking patterns and everyday experiences. Rather than being caused by one thing, it develops and is maintained through an ongoing interaction between many different systems.
The good news is that OCD is very treatable. Understanding how it works is often the first step towards breaking the cycle.
Understanding OCD
People often describe OCD as involving “obsessions” and “compulsions”, but these words can sometimes be misunderstood.
Obsessions are intrusive thoughts, images, urges or uncomfortable sensations that repeatedly enter a person’s mind. They are unwanted and create significant distress.
Compulsions are the behaviours or mental rituals someone performs to reduce that distress or make things feel “just right”.
These compulsions might include:
- Checking
- Washing
- Counting
- Repeating actions
- Asking for reassurance
- Mentally reviewing events
- Arranging objects until they feel “right”
Although the compulsion brings temporary relief, it actually teaches the brain that the obsession was dangerous and the compulsion makes me feel better, making the cycle stronger over time.
Why Does OCD Happen?
There is no single cause of OCD.
Research shows that it develops through an interaction between several different factors.
These include:
- Genetics
- Differences in brain networks involved in habit formation and error detection
- Sensory processing differences
- Anxiety and stress
- Life experiences
- Sleep
- Overall physical health
- Environmental factors
Think of these like pieces of a puzzle.
One child may have a strong genetic predisposition.
Another may develop symptoms after prolonged stress.
Someone else may have heightened sensory sensitivity where things simply never feel “finished” or “quite right.”
For most people, several factors interact together.
The “Ping-Pong Effect”
One of the easiest ways to understand OCD is to imagine a game of ping-pong.
Instead of the ball bouncing between two players, it bounces between the brain, the body, thoughts, emotions and behaviour.
Each bounce strengthens the next one.
For example:
Imagine a teenager touching a classroom door handle.
Suddenly, an intrusive thought appears:
“What if my hands are contaminated?”
At the same time, their brain produces an uncomfortable feeling of uncertainty. Their anxiety quickly rises and they become convinced they need to do something about it.
They immediately wash their hands.
For a few moments, the anxiety disappears.
The brain then learns an important lesson:
“Washing my hands made me feel safe.”
The next time they touch a door handle, the intrusive thought appears even more quickly. The anxiety feels stronger, so they wash their hands again.
Every repetition strengthens the connection between the thought, the uncomfortable feeling and the compulsion.
What started as washing their hands once after using the toilet may gradually become washing after touching door handles, school desks, books, shopping trolleys or even their own belongings.
The brain isn’t trying to make life difficult. It’s trying to protect the person. Unfortunately, each time the ritual reduces anxiety, it accidentally teaches the brain that the danger was real and that washing was necessary.
This is why OCD often grows over time unless the cycle is interrupted.
Another example might be a teenager worried they have left the front door unlocked.
The intrusive thought appears.
Their anxiety rises.
They check the lock.
They feel better.
The brain learns that checking prevented something terrible.
Next time the thought appears, it feels even more believable.
This is why reassurance, checking and rituals provide relief in the short term but strengthen OCD in the long term.
Sometimes It Is Not About Fear
Many people think OCD is always driven by fear.
That is not always true.
For some people, the strongest experience is a powerful feeling that something is incomplete, uneven or simply “not right.”
Research suggests that differences in sensory processing and activity within a part of the brain called the insula may contribute to these uncomfortable sensations.
A child may know logically that both shoes are tied properly, yet one shoe still feels “wrong.”
Someone may rewrite a page several times, not because they think something terrible will happen, but because it simply does not feel finished.
Understanding this can completely change how parents respond.
The child is not being stubborn or perfectionistic.
Their brain is genuinely sending an uncomfortable signal.
Stress Makes OCD Louder
Stress does not usually cause OCD on its own.
However, stress often makes OCD much louder.
When we are stressed:
- Sleep becomes poorer
- Anxiety increases
- Emotional regulation becomes harder
- Thinking becomes less flexible
This makes intrusive thoughts feel more convincing and compulsions harder to resist.
Parents often notice symptoms become worse during:
- Exams
- Family changes
- Illness
- Moving house
- Starting secondary school
- Lack of sleep
This does not mean someone is “going backwards.”
It simply reflects how interconnected our brain, body and stress systems really are.
What Actually Helps?
One of the most important messages for families is this:
OCD is highly treatable.
Recovery does not mean never having intrusive thoughts again.
Instead, treatment teaches the brain that uncomfortable thoughts and feelings can be tolerated without performing compulsions.
1. Exposure and Response Prevention (ERP)
ERP is considered the gold standard psychological treatment for OCD and is recommended by NICE (National Institute for Health and Care Excellence).
During ERP, a person gradually faces situations that trigger their OCD while resisting the urge to perform compulsions.
For example:
A child who repeatedly checks their school bag may deliberately leave after checking it only once.
Initially, anxiety rises.
Eventually, the anxiety naturally falls without checking.
The brain slowly learns:
“I can cope.”
“Nothing bad happened.”
“I do not need the ritual.”
Over time, the brain begins to rewrite the old learning.
2. Cognitive Behavioural Therapy (CBT)
CBT helps people understand how thoughts, emotions and behaviours interact.
Rather than trying to eliminate intrusive thoughts, CBT helps people respond differently to them.
People learn that having a thought does not make it true.
Everyone experiences strange thoughts.
People with OCD simply become stuck treating those thoughts as highly significant.
3. Medication
Selective serotonin reuptake inhibitors (SSRIs) are often recommended, particularly when OCD is moderate to severe or significantly affecting daily life.
Medication does not “cure” OCD.
Instead, it can reduce symptom intensity enough for therapy to become more effective.
Research consistently shows that combining CBT with ERP and medication often produces the best outcomes for moderate to severe OCD.
Lifestyle Is Not a Cure, But It Matters
Lifestyle changes cannot replace evidence-based therapy.
However, they can support the brain and body, making treatment easier.
Research suggests benefits from:
- Consistent sleep routines
- Regular physical activity
- Balanced Mediterranean-style eating patterns rich in fibre, healthy fats and whole foods
- Reducing ultra-processed foods where possible
- Limiting alcohol and recreational drugs in older teenagers and adults
- Maintaining predictable daily routines
Think of these as helping create the best possible environment for the brain to learn new patterns.
How Parents Can Help
One of the hardest parts of parenting a child with OCD is knowing when helping becomes unhelpful.
Parents naturally want to reduce their child’s distress.
Unfortunately, repeatedly providing reassurance or helping with rituals can accidentally strengthen OCD.
Instead, families can:
- Learn about OCD together
- Encourage gradual independence
- Praise bravery rather than perfection
- Avoid participating in compulsions where appropriate and with professional guidance
- Celebrate small successes
- Maintain predictable routines
- Support healthy sleep, movement and nutrition
- Seek professional help early
Progress is rarely perfectly linear.
Some weeks will be easier than others.
That is completely normal.
The Take-Home Message
OCD is not simply about worrying too much.
It is a condition involving the brain, body, emotions, stress systems and behaviour, all interacting in a continuous “ping-pong” cycle that keeps symptoms going.
Fortunately, that same cycle can be interrupted.
Evidence-based therapies such as Exposure and Response Prevention, supported by Cognitive Behavioural Therapy, medication when appropriate, and healthy lifestyle habits, help the brain build new, healthier patterns over time.
Most importantly, remember that people with OCD are not choosing these behaviours.
They are doing the best they can to reduce overwhelming discomfort.
With understanding, patience and the right support, recovery is absolutely possible.
This blog is based on a recent assignment completed as part of a Master’s degree in clinical psychology and draws on evidence from the literature it reviews, including:
- Bottaccioli AG, Bottaccioli F, & Minelli A. (2019). Stress and the psyche-brain-immune network in psychiatric diseases based on psychoneuroendocrineimmunology. Annals of the New York Academy of Sciences.
- Fineberg NA et al. (2020). Clinical advances in obsessive-compulsive disorder: A position statement by the International College of Obsessive-Compulsive Spectrum Disorders. International Clinical Psychopharmacology.
- Hirschtritt ME, Bloch MH, & Mathews CA. (2017). Obsessive-Compulsive Disorder: Advances in Diagnosis and Treatment. JAMA.
- National Institute for Health and Care Excellence (NICE). (2024). Obsessive-compulsive disorder and body dysmorphic disorder: Treatment (CG31).
- Robbins TW, Vaghi MM, & Banca P. (2019). Obsessive-Compulsive Disorder: Puzzles and Prospects. Neuron.
- World Health Organization. (2019). ICD-11 for Mortality and Morbidity Statistics.
by Catherine Milford