Complex OCD
What it is, why it is so often missed, and what can be done about it
Obsessive-compulsive disorder is defined by two things: obsessions (intrusive, unwanted thoughts, images or urges that cause anxiety or distress) and compulsions, the repetitive actions or mental rituals a person feels driven to perform to relieve that distress or prevent something feared from happening. OCD affects roughly one to two people in every hundred, usually beginning in adolescence or early adulthood, and the World Health Organization has long ranked it among the most disabling conditions of any kind. Yet it is under-recognised: symptoms are often hidden through shame, mistaken for a personality trait, or misread as anxiety or depression, and many people live with the condition for years before it is diagnosed. That matters, because OCD tends to respond best when treated early.
1 in 50true lifetime prevalence
1 in 135seen in primary & secondary care
17 yearsaverage delay to treatment
10thleading cause of disability (WHO)
The disease did not become more common; our recognition of it did, and clinical detection has never caught up. Millions of people are simply missing from the healthcare system.
- Why it stays hidden
- People hide OCD not for lack of distress but because of what the obsessions are about. Intrusive thoughts of harming a loved one, unwanted sexual or blasphemous thoughts, or a private conviction of being dangerous or evil are experienced as shameful evidence about oneself rather than as symptoms, and no one asks. Many people have no visible rituals at all: their compulsions are mental (reviewing, neutralising, seeking reassurance) and are invisible to everyone, including clinicians. The everyday trivialisation of the word ("I'm so OCD about my desk") makes sufferers dismiss their own symptoms as a quirk and lowers doctors' index of suspicion. And OCD is a good mimic: roughly one in five cases is first diagnosed as generalised anxiety or depression, and it is regularly mistaken for, or coexists with, psychosis, ADHD and autism. The result is the seventeen-year silence.
- Myths and realities
- OCD is not being neat and organised: obsessions cause intense distress and compulsions bring no pleasure. It is not simply an anxiety disorder: it has its own chapter in the modern classifications and overlaps with tic disorders and the wider obsessive-compulsive spectrum. People cannot "just stop": compulsions are driven by over-active brain circuits, not by choice or character. It is not only about checking and cleaning: harm, sexual, religious and symmetry obsessions are common, and many are completely invisible. And it does not pick perfectionists: it affects every kind of personality, can begin in early childhood, and respects no social or cultural boundary.
- What makes OCD "complex"
- "Complex OCD" is not a separate diagnosis; it is the term I and other clinicians use for OCD that does not fit the straightforward picture and needs a more specialised approach. That is usually for one or more of the following reasons: the illness has not responded adequately to first-line treatment (a proper course of cognitive behavioural therapy with exposure and response prevention, or a serotonergic antidepressant at an adequate dose for an adequate time); it occurs alongside another condition that changes how it presents and how it should be treated, such as Tourette syndrome or tics, body dysmorphic disorder, hoarding, autism, ADHD, depression or bipolar disorder; it has arisen in the context of a neurological illness or brain injury; it is dominated by mental compulsions or rumination rather than visible rituals, or accompanied by poor insight; or it has become so severe and long-standing that it has taken over daily life: work, study, relationships and, often, the routines of the whole family.
- Why untreated OCD is not benign
- Severe OCD is as disabling as any serious mental illness, and left untreated it does physical harm that is easily missed: skin damage and infection from washing with bleach or undiluted cleaning agents; dehydration, malnutrition and dental erosion from contamination fears about food, drink and the mouth; injuries, respiratory illness and isolation in hoarded homes; and, when avoidance extends to healthcare itself, serious physical illness diagnosed late. It carries a substantially increased risk of self-harm, often missed because the despair is attributed to depression and the obsessions are never disclosed. None of this is inevitable. It is the case for asking, and for treating properly.
- OCD and Tourette syndrome
- A particular area of my practice is the overlap between OCD and tic disorders. Up to half of people with Tourette syndrome have obsessive-compulsive symptoms, and OCD that arises with tics often looks different: "just right" feelings, symmetry and ordering, touching, counting and the need to repeat actions until a sensation is satisfied, rather than fear-driven checking or washing. This "tourettic" OCD frequently responds less well to standard serotonergic medication alone and may benefit from different combinations of treatment, including habit reversal training and specific augmentation strategies, which is why I place so much weight on an accurate diagnosis at the outset.
- Why specialist assessment matters
- When I assess someone, I begin by establishing exactly what is going on. Rituals that look like OCD can also be part of autism, tic disorders, health anxiety, eating disorders or, occasionally, psychosis, and each calls for a different approach. I review the full history of the illness and of every treatment tried, how long, at what dose or intensity, and with what result, look for coexisting conditions, and consider physical and neurological health, arranging investigations where they are indicated. I measure severity with standard rating scales so that progress can be tracked objectively. Where appropriate, and with your agreement, I involve family members, because the way a household adapts around OCD can itself keep the illness going. You leave with a written opinion and a plan we have agreed together.
- How I treat complex OCD
- I follow the stepped approach set out in national (NICE) guidance, intensified to match the severity and complexity of the illness. Cognitive behavioural therapy with exposure and response prevention remains the foundation, and for complex illness may need to be delivered more intensively, at home, or by therapists experienced in the particular comorbidity. I often use medication alongside: serotonergic antidepressants at higher doses and for longer than in depression; clomipramine; and, where response is incomplete, the addition of other agents, low-dose antipsychotic medication being the best-supported option, especially when tics are present. For the most severe illness there are nationally commissioned intensive and inpatient services. For a small number of people with severe OCD that has not responded to all of these, neuromodulation (deep brain stimulation, or focused neurosurgical procedures) is available in the UK through specialist centres, including Queen Square, after careful multidisciplinary review. My research has contributed directly to the evidence base for these treatments.
- What to expect
- OCD is generally a long-term condition, but it is a treatable one. With the right combination of treatment, most people improve meaningfully, including many who have been unwell for years, and improvement is usually maintained with a plan for preventing relapse. Individual outcomes vary; a consultation with me involves a full assessment, and I will discuss any treatment I recommend with you in full, including its benefits, risks and alternatives.
- Seeking help
- If intrusive thoughts or rituals are taking up more than an hour a day, causing marked distress, or getting in the way of work, study or relationships, it is worth seeking an assessment. Your GP can refer you, or you can enquire about a private consultation directly through the appointments page. Referrals to my NHS Tourette and OCD clinic at Queen Square are accepted from GPs and specialists anywhere in the UK (see contact). If you are in crisis, please see the emergency information on the professional standards page.