Internal Family Systems: what the research says

No good evidence yet: IFS has only a few small, early studies. Talking therapies such as CBT have more evidence for low mood and worry.

What a session is

A talking therapy that sees the mind as made up of different 'parts', such as a critical part or a hurt part. With a therapist, you get to know these parts with curiosity and calm.

What the research says

• Low mood: Only small, early studies so far. If low mood lasts 2 weeks or more, see a GP; talking therapies such as CBT have good evidence. No good evidence yet · NHS, 2026
• Trauma and PTSD: Only small, early studies so far. UK guidance recommends trauma-focused CBT or EMDR for PTSD. No good evidence yet · NICE, 2018 · NHS, 2026
• Worry and anxiety: Not studied in the sources we use. For worry that affects daily life, a GP usually offers CBT first. No good evidence yet · NHS, 2024
• Stress, sleep, pain, menopause and grief: Not studied in the sources we use. No good evidence yet

More on each need: Lift your mood · Feel calmer

Is it safe?

Talking about painful experiences can be upsetting at first, so tell your therapist if it is. If you have an eating disorder, bipolar disorder, a personality disorder or psychosis, talk to your GP first. NICE, 2022 · NHS, 2025

Sessions on Sissoo complement medical care and never replace it. Please don’t stop or change any treatment without talking to your doctor. If you feel very low or think about ending your life, call your local emergency number now.

Checked 22 October 2026. Next check by April 2027. How we rate the evidence.