Therapy for OCD: what treatment involves, how long it takes and how to choose

You go back to the front door to check you have locked it, even though you clearly remember doing so. You wash your hands until the skin cracks. Or a thought that horrifies you keeps coming back and you spend the afternoon trying to neutralise it. You know it makes no sense, and that is exactly what wears you out.

Obsessive-compulsive disorder responds well to therapy, yet on average people take about seven years to ask for help. If you are thinking about therapy for OCD, this guide explains when it is worth seeing a psychologist, which treatment works, what therapy is like from the inside, how long it takes, whether it works online, what role the family plays and how to choose a professional.

When to see a psychologist for OCD

The NHS defines obsessions as unwanted and unpleasant thoughts, images or urges that keep entering your mind and cause anxiety, disgust or unease, and compulsions as repetitive behaviours or mental acts you feel you need to do to relieve those feelings for a while. OCD can start as early as 6 years old, although it most often begins around puberty and early adulthood.

A meta-analysis by Pellegrini and colleagues, covering 31 studies, estimated that on average about seven years pass between the start of OCD and seeking help, and that the first appointment usually comes at around 29. That delay matters: the longer OCD goes untreated, the worse the outlook tends to be. The NHS adds that people are sometimes reluctant to seek help because they feel ashamed, and points out that OCD is a health condition like any other and not your fault.

It is worth getting help if:

• Obsessions or rituals take up more than an hour a day.
• They cause you a lot of distress or interfere with work, study or relationships.
• You avoid places, objects or people so as not to trigger the obsessions.
• You need other people to reassure you again and again or to join in with your rituals.
• You try to resist, but the anxiety rises until you give in.

If you want to get your bearings before your first appointment, the OCD Test has 16 questions about the last month, takes about five minutes and measures obsessions, compulsions and how much they interfere with daily life. If what weighs on you most is thoughts you do not want to have, Intrusive thoughts: what they are, why they appear and when to worry may help too.

Which treatment works for OCD

The NHS explains that there are two main treatments: talking therapy, usually cognitive behavioural therapy with exposure and response prevention (ERP), and medicine, usually a type of antidepressant. Which is recommended depends on how much OCD affects your life.

A meta-analysis by Öst and colleagues brought together 37 clinical trials of cognitive behavioural therapy for OCD and found very large effects compared with a waiting list and with placebo. There were no clear differences between individual and group therapy, or between ERP and cognitive therapy, and therapy was more effective than antidepressants alone. We explain what this approach involves in Cognitive behavioural therapy: what it is, how it works and what it treats.

The British NICE guideline, by contrast, warns that there is no convincing evidence that other therapies, such as psychoanalysis, transactional analysis, hypnosis or couple therapy, work as a specific treatment for OCD.

What exposure and response prevention is like

As the NHS describes it, therapy starts by breaking the problem down into its parts, thoughts, physical feelings and actions, and then encourages you to face your fears and have obsessive thoughts without neutralising them with compulsions, starting with whatever causes you the least anxiety. In practice it usually follows these steps:

1. Understanding the OCD cycle: a compulsion brings relief for a while, but the relief does not last and the obsession comes back.
2. Building a ladder: with your therapist, you rank the situations you fear from least to most anxiety-provoking. For example, touching a door handle, then the rail on the bus and later eating without having washed your hands three times.
3. Exposure without the ritual: you stay in the situation without washing, checking or asking to be reassured, and find that the anxiety goes down on its own and that what you feared does not happen.
4. Practising between sessions: the NHS notes that treatment includes exercises done at home between sessions.
5. Preventing relapse: towards the end, the NICE guideline recommends explaining how to apply what you have learned if symptoms come back or new ones appear.

If the obsessions do not come with visible rituals, sometimes called pure O, the NICE guideline suggests cognitive behavioural therapy that includes exposure to the thoughts themselves and giving up mental rituals and neutralising strategies. It also allows for adding cognitive therapy adapted for OCD so that the improvement lasts in the long term. That work focuses on the beliefs that feed the cycle, such as giving a thought too much weight or feeling responsible for any misfortune.

It is not a comfortable treatment. The NHS itself acknowledges that it may be hard work, but says many people find that when they confront their obsessions, the anxiety eventually improves or goes away.

What about medication for OCD?

The NICE guideline organises treatment in steps. If OCD causes little impairment, a brief therapy with ERP is offered first. If impairment is moderate, or the brief therapy is not enough, you can choose between an SSRI antidepressant and a more intensive therapy with ERP, because they appear to be comparably effective. If impairment is severe, it recommends combining the two. Medication is prescribed by a doctor, not a psychologist. The NHS warns that an SSRI can take up to 12 weeks to make a noticeable difference, that most people take it for at least a year and that you should not stop it suddenly without talking to your doctor first.

How long therapy for OCD takes

According to the NHS, people with fairly mild OCD usually need about 8 to 20 sessions with a therapist, with exercises done at home between sessions, and more severe OCD may need a longer course. The NICE guideline measures it in hours: up to 10 hours of therapist time in brief formats and more than 10 in more intensive ones. The NHS also warns that it can take several months before you notice the benefit.

What matters is that the professional explains the plan from the start, measures how you are doing, for example with scales such as the Y-BOCS, which rates how severe obsessions and compulsions are, and adjusts the ladder as you progress.

Does online therapy work for OCD?

Yes, and there is evidence for it. A meta-analysis by Wootton brought together 18 studies with 823 people who had cognitive behavioural therapy for OCD remotely. Symptoms fell considerably, treatment worked better than control conditions and the results were not meaningfully different from face-to-face therapy.

With OCD, many exposures also make sense at home, which is where cleaning, checking or ordering rituals usually happen. The NICE guideline already allowed for home-based treatment, or treatment by telephone, for people who cannot leave the house, for example because of fears of contamination. If you have never had online therapy, Online psychologist: how to choose well and what to expect from video-call therapy may help.

The family in OCD treatment

With OCD it is common for the family to end up drawn into the rituals: answering the same question for the umpteenth time to reassure, washing clothes the way the person asks or waiting until they finish checking. This is known as family accommodation. A review by a team at Hospital Clínic de Barcelona, covering 108 studies and almost 9,000 people with OCD, found that this accommodation is moderate, goes with more severe OCD and decreases with cognitive behavioural therapy, both individual and family-based.

The NICE guideline recommends helping families to stop taking part in rituals in a sensitive, supportive way and, where appropriate, involving a family member as a co-therapist in ERP. A meta-analysis by Thompson-Hollands and colleagues, covering 29 studies and 1,366 patients, found that treatments including the family had a large effect, and that those that tackled accommodation brought bigger improvements in day-to-day functioning.

How to choose a psychologist for OCD

These checks help you choose well:

• Licensing and registration. That comes first, whatever the approach.
• They use ERP. Ask directly how they treat OCD. If the answer does not include exposure and response prevention, look elsewhere.
• Specific training. The NICE guideline asks that anyone delivering these therapies is trained in them and receives supervision.
• They do not just reassure you. Asking to be told that everything is fine works like one more compulsion, and good therapy helps you stop doing it.
• A plan with measurable goals and a rough idea of how many sessions will be needed.
• Coordination with a psychiatrist, if you are also taking medication.

A psychologist for OCD

At MyPsicoTest we recommend Xènia Capel Salcedo, a licensed clinical psychologist (COPC 14982) with a master's degree in Clinical Psychology and Psychotherapy. She sees clients in Igualada and Sant Sadurní d'Anoia and also through online therapy, and on her blog she has written an article about treating OCD by video call. In it she explains how she works: exposure and response prevention, with exposures guided live and tasks between sessions, plus cognitive work on the beliefs that keep OCD going, such as thought-action fusion, inflated responsibility or intolerance of uncertainty. As she describes it, each session lasts 50 to 60 minutes and starts by reviewing the week's exposures. She works from an integrative, evidence-based approach: on her website she explains that she uses tools from cognitive behavioural therapy, EMDR, systemic therapy and person-centred therapy. Sessions are available in English, Spanish or Catalan, and the first contact is a free, no-commitment information session by phone. She herself points out that in a serious crisis or psychiatric emergency, immediate in-person care is what is needed.

If your result worries you or you want a professional assessment, you can talk to Xènia Capel Salcedo, a licensed psychologist (COPC reg. 14982), who offers a free first consultation call and online therapy from anywhere.

MyPsicoTest team · Updated: 11 October 2026