[Time to modernise healthcare regarding functional disorders].

The Swedish guideline on post covid-19 and related syndromes classify six overlapping conditions. A functional perspective, as used in Denmark, distinguishes physiological reactions from diseases, aiding understanding and treatment. Functional symptoms arise from dysregulated adaptation systems reacting excessively. This dysregulation can persist, leading to various symptoms. Effective treatment focuses on stabilizing these systems through knowledge, behavioral changes and gradual exposure to discomfort. A biopsychosocial model addressing biological, psychological, and social factors is key. Denmark's structured approach has improved care, and similar competence-building efforts in Sweden could enhance treatment for post-infectious and long term functional conditions.