Is Hoarding a Mental Illness?

Yes. Hoarding is formally classified as a mental illness in both the two major diagnostic systems used in the UK. It was recognised as a distinct psychiatric disorder in the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, fifth edition) in 2013, and in the World Health Organization's ICD-11 (International Classification of Diseases, eleventh revision) in 2018. The NHS treats it as a mental health condition and provides access to psychological treatment for it.

Understanding that hoarding is a mental illness — not a lifestyle choice or a character flaw — is important for three reasons. It changes how the person is treated, it changes what interventions are used, and it opens access to formal support.

What the classifications say

The DSM-5 lists hoarding disorder under Obsessive-Compulsive and Related Disorders. The diagnostic criteria require persistent difficulty discarding or parting with possessions regardless of value, driven by a perceived need to save and distress at parting with them, leading to accumulation that clutters and compromises the use of active living areas, causing significant distress or impairment.

The ICD-11 places hoarding disorder in the same broad group and uses very similar criteria. Both systems require that the behaviour is not better explained by another condition — for example, the accumulation cannot be a symptom of dementia, an organic brain injury or a psychotic disorder.

What that means in practice

Because hoarding disorder is a recognised mental illness, several things follow. A GP can refer a person for psychological assessment and treatment through the NHS. Adult social care has safeguarding duties where the person is at risk. Housing associations and councils are increasingly expected to treat hoarding as a mental health issue rather than a tenancy breach in the first instance. Fire services in many areas offer targeted home safety visits. And there is a growing evidence base for treatments that specifically work.

The front-line treatment

The current evidence-based front-line treatment for hoarding disorder is cognitive behavioural therapy (CBT) specifically adapted for hoarding. Standard CBT does not work as well; the adaptations are important. They include structured work on beliefs about possessions, exposure to discarding, skills training for organisation and decision-making, and often home-based sessions rather than clinic-only appointments.

Medication is sometimes used, particularly SSRIs (selective serotonin reuptake inhibitors), especially where depression or anxiety co-occurs. Evidence for medication as a standalone treatment for hoarding is weaker than for the psychological approach.

Why the classification took so long

Hoarding behaviour has been recognised for centuries but was long assumed to be a symptom of other disorders — mainly OCD or personality disorders. It was only through decades of research, led particularly by clinicians in the US, that hoarding was recognised as having its own distinctive pattern of symptoms, prognosis and treatment response. The DSM-5 classification in 2013 was a landmark for both clinicians and the many people who had been living with the condition without a name for what they were experiencing.

Common misunderstandings

Because the classification is relatively recent, there are still common misunderstandings. It is worth naming them clearly.

• Hoarding is not the same as OCD, though the two can co-occur.
• Hoarding is not laziness or poor discipline.
• Hoarding is not greed. Many hoarders live in relative poverty and much of what they accumulate has no financial value.
• Hoarding is not always about acquiring new items. Difficulty discarding — including items already owned — is the defining feature.
• Hoarding is not a phase. Untreated, it usually worsens with age.

Why recognising it as an illness helps

When hoarding is treated as a mental illness rather than a housekeeping problem, several things change. The person is more likely to be offered therapy. Family members are less likely to blame or shame them, and more likely to accept that lasting change takes time. Housing officers are less likely to jump to eviction as a first response. Professional clearance teams work as part of a broader support plan rather than as a one-off fix. All of these change outcomes for the better.

What to do with this knowledge

If you or someone you love shows signs of hoarding, the first step is to speak to a GP. Explain what is happening and ask about referral for CBT adapted for hoarding. In parallel, look at Hoarding UK and Mind for information and peer support, and — where safety in the home is an issue — engage a specialist clearance team who understand that they are working with a mental health condition, not a mess.

Recognising hoarding as a mental illness does not solve it. But it opens the door to the treatments and support that do.