What does ADHD, AST, RSD mean?

We have compiled the words and acronyms around Neurodiversity and asked clinicians and experts to define them, have suggestions on words to add? Email us and we will add an explanation to it here!


  • ADHD

    Attention Deficit Hyperavctivity Disorder – a prevalent, persistent and impairning neurodevelopmental diagnosis.

  • Empowement

    The process of becoming stronger and more confident, especially in controlling one’s life and claiming one’s rights.

  • Self-efficacy

    An individual’s belief in their capacity to act in the ways necessary to reach specific goals.

  • Polypharmacy

    When a person is on three or more different medications for different conditions the same time, they fall under the category Polypharmacy.

  • Multimorbidity

    An individual suffering from three or more different conditions at the same time.

  • Orthorexia

    An unhealthy focus on exercises and eating healthy food leading to negative consequences.

  • Comorbidity

    Meeting the diagnostic criteria for two or more psychiatric disorders, for example ADHD and substance use disorders (SUD).

  • ADD

    Attention Deficit Disorder – ADHD without (external) hyperactivity/impulsivity.

  • AST

    Autism spectrum disorder. All autistic diagnosis on the spectrum from Asperger to the most severe presentation of autism.

  • Heterogeneity

    ADHD ADD can be very different things for different persons and you can have more of an ADHD-profile in part of your life and be more ADD-like in other periods.

  • SUD

    Substance use disorders i.e., addiction or dependency of alcohol, nicotine or drugs.

  • CBT

    Cognitive behavior therapy. Focus on how thoughts, beliefs and attitudes affect feelings and behavior.

  • DBT

    A development of CBT with focus to understand accept and handle feelings and emotions.

  • IUD

    Intrauterine device or coil.

  • ND

    Neurodevelopmental disorders (ADHD, ADD, autism, tics, Tourettes, Intellectual disabilities etc.)

  • Executive function

    The brains high-level skills for control and coordination of our behaviors.

  • RSD

    Rejection Sensitivity Dysphoria – Intense fear of real or imagined rejection.
    See blog about RSD

  • ADHD-coaching

    A complement to traditional health care for building concrete skills and tools for better everyday function and ADHD-control. Read more about coaching with Letterlife.

  • PMDS

    Premenstrual dysphoric disorder – The severe, and disabling form of PMS. Impairing symptoms of physical and/or emotional symptoms associated to the menstrual cycle affecting quality of life.

  • PMS

    Premenstrual syndrome – Physical and emotional (mood)symptoms related to the luteal phase (days or week) before menstrual period.