This programme is a treatment manual for mental health professionals. It assumes clinical training, experience with personality disorders, and a supervision framework. It replaces neither your clinical judgement nor your professional responsibility. Diagnostic criteria are reworded here in our own words, never reproduced. Two warnings specific to this indication. This manual does not treat persecutory delusions, which belong to a psychotic disorder and call for different care: section 7. And the level of evidence is thin: no controlled trial has studied this disorder alone, as section 11 states plainly.
1. The programme at a glance
Indication. Paranoid personality in adults, in outpatient settings, without delusions, with a request — even an indirect one — formulated by the patient themselves.
Reference model. Cognitive therapy for personality disorders, centred on mistrust and its consequences, enriched by three contributions: work on alliance ruptures, knowledge from research on everyday paranoia — vigilance, worry, sleep —, and, in the final phase, work on the schemas that lie beneath mistrust.
Format. Treatment lasting about a year, that is, some forty sessions in routine practice; this manual describes sixteen key sessions, organised in five phases, with extension points indicated. 50-minute sessions, weekly during the first two phases, then fortnightly. Three booster sessions.
Targeted mechanism. Interrupting the cycle of mistrust through its accessible links: vigilance that finds what it is looking for, hostile interpretation of ambiguous situations, retaliation or withdrawal that provoke the feared reaction, and rumination that keeps the grievance alive. Then loosening the core belief — others will end up doing harm — by testing it in real relationships, including the therapeutic relationship.
| Phase |
Session |
Topic |
Session output |
| I. Alliance |
1 |
Welcoming without alarming |
Request formulated by the patient, framework explained |
|
2 |
The transparency contract |
Goals chosen, record rules written down |
|
3 |
Assessing without interrogating |
Risks assessed, history taken |
| II. Understanding |
4 |
The cycle of mistrust |
Cycle drawn from a real episode |
|
5 |
What mistrust costs and protects |
Written balance sheet |
|
6 |
Vigilance, rumination, sleep |
Time spent on vigilance measured, sleep plan |
| III. Loosening |
7 |
Ambiguous situations |
Three explanations per situation |
|
8 |
Testing a hypothesis |
First behavioural experiment |
|
9 |
Safety behaviours |
Two checking behaviours reduced |
|
10 |
Midpoint review |
Measures repeated, plan revised |
| IV. Relationships |
11 |
Anger and retaliation |
Retaliation delay in place |
|
12 |
Speaking up without attacking |
Two requests made without accusation |
|
13 |
Graded trust |
Trust scale for three close people |
| V. Consolidation |
14 |
What lies underneath |
Beliefs and history linked |
|
15 |
The therapeutic relationship as a test |
One rupture repaired and named |
|
16 |
Review, relapse, next steps |
Plan written, measures repeated |
What sets this programme apart from the other manuals on this site. Three things. A patient who does not come for the disorder being treated. A therapist whose conduct — what they announce, what they write, what they acknowledge — matters more than techniques. And a level of evidence that the manual sets out honestly instead of dressing it up.
2. Before you begin
Who this programme is for
Psychologists, psychiatrists and psychotherapists familiar with cognitive behavioural therapy, with experience of personality disorders, who can rely on supervision. That last point is not a formality: this work puts the therapist in the position of the accused, and there needs to be a place to say so.
The four preliminary decisions
1. Is this a personality trait or a psychotic disorder? Is the patient's mistrust a lasting way of reading relationships, or a fixed, sometimes bizarre delusional conviction with a persecutory system? The answer changes the treatment. Section 7.
2. Is this mistrust justified, wholly or partly? Harassment at work, discrimination, domestic violence or real surveillance must have been looked for before talking about a disorder. Section 5.
3. Is there a risk to others or to the patient? Long-standing grievances, plans for revenge, weapons, harassment of a specific person, suicidal ideation. Section 9.
4. What is the patient asking for? Almost never "treat my mistrust". Rather: to sleep, to stop blowing up at work, to cope with legal proceedings, to save a relationship. That is the request that is accepted, and it is through it that the work is done.
What this programme does not treat
Delusional disorder, persecutory type, and schizophrenia. Delusions call for a different setting, with psychiatric assessment and often medication.
Mistrust that occurs only during substance use, stimulants in particular. The substance use is treated first.
Recent-onset paranoia in older people, which first calls for a cognitive and sensory assessment.
Situations in which the patient is actively harassing someone else, which call for a protective framework before any psychotherapy.
What this programme is not
It is not a therapy that convinces the patient they are wrong. Nor is it a therapy that validates their suspicions to preserve the alliance. It is a third, narrower path: taking seriously what the patient experiences, examining with them what their way of protecting themselves costs them, and trying out other ways in real life.
How to use it
Read sections 3 to 14 first: they ground the choices made in the sessions. The sessions described are key sessions, not a timed programme; each may take two or three. Sections 31 to 36 detail what the sessions only introduce. Section 39 says what must not be dropped.
3. The clinical picture
What defines the disorder
Lasting and pervasive mistrust of others, present since early adulthood, which leads the person to interpret others' intentions as malevolent without sufficient grounds, and which shows itself in many areas of life.
What characterises the disorder is not mistrust, which everyone feels, but its rigidity: it is not corrected by contact with the facts, it extends to close people who have never betrayed, and it organises the person's life.
The forms it takes
Suspicion of being exploited, deceived or harmed, without sufficient grounds.
Doubts about the loyalty of friends, colleagues or partner, and a search for signs that confirm them.
Reluctance to confide, for fear that information will be used against them.
Reading humiliating or threatening hidden meanings into harmless remarks.
Lasting resentment: offences, real or perceived, are neither forgotten nor forgiven.
Quick retaliation against what is experienced as an attack on their reputation or person, often through anger or counter-attack.
Suspicious jealousy towards the partner, without sufficient reason.
What patients describe
Almost never mistrust. They describe a world: colleagues who are plotting, an employer who wants to push them out, a neighbour trying to cause harm, a family that takes advantage of them. When the alliance allows it, they also describe exhaustion: always being on guard takes its toll.
They are often intelligent, precise and attentive to detail, and their account is coherent. Coherence does not distinguish the disorder from a real situation: that is why section 5 exists.
What is seen in the consulting room
Vigilance about the framework: questions about the record, notes, recording, what will be passed on.
Sensitivity to lateness, changes of appointment time and oversights, which are interpreted.
Difficulty answering personal questions, and sometimes a reserve that looks like detachment.
Anger that can flare up quickly, often over a detail experienced as a lack of respect.
And, behind the hardness, a vulnerability that the patient carefully protects: the conviction of being weak in the face of others who are stronger and malevolent.
What is not part of it
Delusions, hallucinations, disorganised speech. Their presence points to section 7.
Epidemiology, briefly
General population surveys put paranoid personality at between one and a few per cent depending on the method, with figures that vary widely from one study to another. It is under-represented in clinical settings, because the people concerned rarely seek help for it. It is associated with significant social and occupational disability, and with a high frequency of conflicts, relationship breakdowns and legal proceedings.
4. The cycle of mistrust
The model that guides this programme fits into one cycle. It is cognitive and interpersonal, and it has one essential property: it confirms itself.
The central piece
A core belief about others and oneself: people will end up doing harm if you let them; I am vulnerable; letting your guard down means getting taken for a ride. It often forms in a history where mistrust was, at least for a while, an appropriate response — humiliation, betrayal, violence, a hostile family climate —, but this is not always the case, and it is not imposed.
The five links
1. The perceived threat. An ambiguous situation — a colleague who falls silent when you arrive, an email with no greeting, a look.
2. Vigilance. Attention turns to signs of threat, and finds them: every day contains ambiguous signs. Vigilance does not merely detect, it selects.
3. Hostile interpretation. Among the possible explanations, the one that protects best is adopted: they were talking about me. It is adopted quickly, before the others have been considered.
4. The protective response. Either retaliation — a cutting remark, an accusation, a complaint —, or withdrawal — silence, coldness, avoidance, withholding information.
5. Others' reaction. Faced with retaliation or coldness, others become mistrustful in turn, move away, sometimes gang up. And the belief is confirmed: I knew it.
The two maintaining loops
Rumination. Between episodes, the patient goes over offences, prepares responses, anticipates the next attacks. Rumination and worry maintain mistrust; research on everyday paranoia converges on this.
Safety behaviours. Checking, keeping evidence, saying nothing about oneself, monitoring. They prevent the discovery that the threat would not have materialised, and they make the patient seem stranger to others.
What treatment does
It does not tackle the core belief first. It acts on the accessible links: it reduces vigilance and rumination, it slows down interpretation, it replaces retaliation with assertiveness and withdrawal with graded trust, and it lets others react differently. Once the cycle has slowed down, the core belief becomes open to discussion. Not before.
What the model explains to the patient
That they are not mad, and that their caution had its reasons. That their way of protecting themselves has a cost, which they know better than anyone. And that this cost comes partly from what their protection provokes in others — something that can be changed without asking them to trust everyone.
5. Justified mistrust, excessive mistrust
Why this section exists
Because mistrust is not always a symptom. A patient may really be harassed, discriminated against, watched or cheated, and at the same time have a paranoid personality. They may also have no disorder and a genuinely hostile life. Making the diagnosis without having looked into the reality of the threat is a clinical error, and an ethical one.
What needs to be looked for
Harassment at work, which produces lasting vigilance in people who previously had none.
Discrimination — related to origin, skin colour, religion, sexual orientation, disability —, which produces mistrust grounded in repeated, real experiences. Research speaks of cultural mistrust or minority stress: it is an adaptation, not a disorder.
Domestic violence and coercive control, in which the person under surveillance seems mistrustful and is so with good reason.
A history of persecution, exile, detention, torture.
Real disputes: inheritance, dismissal, neighbours.
How to tell the difference
No single criterion is enough. Four questions help.
1. Is the mistrust limited to a threatening context, or does it extend to unrelated people and areas?
2. Does it predate the current situation, going back to early adulthood, or did it appear with it?
3. Is it corrected by reassuring facts, or is every reassuring fact reinterpreted as a trick?
4. Are close people who have never betrayed the patient its target?
What you do when the threat is real
You say so. "What you're describing at work sounds like harassment, and your vigilance is an understandable response to it." You refer to what protects: occupational health, a lawyer, a support organisation, protective services. And, if the patient also shows mistrust that extends beyond this situation, you work on the extension, not on the real situation.
What you never do
Treat as a distortion what is a lived experience of discrimination. The patient will sense it, and will be right to mistrust you.