What Is CBT and How Does It Actually Work?

The Core Idea Behind CBT

Cognitive Behavioural Therapy is built on one deceptively simple insight: it's not the events in our lives that determine how we feel, but the meaning we give to those events. This idea — originally developed by psychiatrist Aaron Beck in the 1960s — has been tested, refined, and validated in thousands of clinical trials over six decades, making CBT one of the most evidence-based therapeutic approaches available.

The word "cognitive" refers to our thoughts and mental processes — the automatic interpretations, assumptions, and beliefs that colour every experience we have. The word "behavioural" refers to the things we do in response to those thoughts and feelings — the actions we take and the actions we avoid. CBT works with both.

"The goal of CBT isn't to think positively. It's to think accurately — and to notice when your thinking has drifted into patterns that cause you unnecessary suffering."

What Happens in a CBT Session

CBT is a structured, collaborative form of therapy. You and your therapist work together as a team, investigating your thoughts, feelings, and behaviours with curiosity rather than judgment. A typical CBT session might involve:

• Reviewing a difficult situation that arose since your last session and unpacking the thoughts and feelings it triggered

• Identifying "cognitive distortions" — patterns in your thinking that are unhelpful, inaccurate, or disproportionate (see the box below for common examples)

• Practising "thought records" — a structured way of examining a thought, identifying the evidence for and against it, and arriving at a more balanced perspective

• Exploring how certain behaviours (like avoidance, reassurance-seeking, or over-checking) maintain the problems you're trying to solve

• Designing small "behavioural experiments" to test your beliefs in real life — and discover that the feared outcome often doesn't happen, or that you can cope better than you thought

Common cognitive distortions CBT addresses

All-or-nothing thinking — "If it's not perfect, it's a complete failure." · Catastrophising — "This one mistake will ruin everything." · Mind reading — "They didn't reply quickly; they must be annoyed with me." · Fortune telling — "I know it's going to go badly." · Emotional reasoning — "I feel stupid, therefore I am stupid." · Should statements — "I should be able to handle this. I shouldn't feel this way."

What CBT Is Particularly Effective For

CBT has the strongest evidence base for: anxiety disorders (generalised anxiety, panic disorder, social anxiety, OCD, health anxiety), depression, phobias, PTSD, eating disorders, sleep difficulties, and low self-esteem. It's also widely used as a component of trauma-focused therapy, and adapted versions (like DBT and ACT) have extended its principles to more complex presentations.

CBT is not, however, the right approach for everyone. People who want to explore the deeper roots of their difficulties — early experiences, attachment patterns, the unconscious — may find that person-centred or psychodynamic therapy is a better fit. At Selfen, we offer a range of therapeutic approaches and will always discuss what might work best for you during your intro call.

How Long Does CBT Take?

One of CBT's advantages is its relative efficiency. Many people notice meaningful changes within 8–16 sessions. Because CBT is skills-based, the tools you develop in therapy are yours to keep — they continue working long after the sessions have ended. This is unlike some other forms of therapy, which are better suited to longer-term work.

That said, CBT for complex trauma, long-standing patterns, or multiple presentations may benefit from a longer course of work. Your therapist will discuss what they recommend after your first few sessions.