Carbohydrates not absorbed in the small intestine are fermented by colonic bacteria to organic acids and gases(e.g. carbon dioxide, hydrogen and methane), part of which is absorbed in the colon, the other part remaining in the lumen. Large interindividual differences have been demonstrated for the production of such acids and gas. Carbohydrate malabsorption can be diagnosed by using the hydrogen breath test, because the gases produced after administration of a provocative dose of carbohydrate are unique products of bacterial carbohydrate fermentation.

Familial Mediterranean fever (FMF), also called periodic disease, Armenian disease, etc., is a prototypical autoinflammatory disorder where the underlying mechanism is the dysfunction of innate immunity, resulting in unprovoked episodes of inflammation.¹ Although considered rare worldwide, it is prevalent in people of Mediterranean origin; however, one can expect to encounter patients in all parts of the modern world. FMF is a monogenic disease with autosomal recessive inheritance.² Unlike other monogenic disorders, the diagnosis remains largely clinical, and it is important to understand the limitations of genetic testing. Another distinguishing feature is the well-established effectiveness of lifelong monotherapy with colchicine in preventing attacks and complications.³

Diarrhoea, acute or chronic, is a common gastrointestinal symptom in healthcare. In most cases, acute diarrhoea in healthy individuals requires limited diagnostic and therapeutic efforts, except for the replacement of fluid electrolytes, and stool culture in severe occurrences. Acute diarrhoea is often self-limiting due to short-lived reactions to food intake and bacterial or viral infections. However, diarrhoea can persist and fulfil definitions of chronicity when a month or more has passed since the onset. Here we discuss some basic mistakes that should be avoided when managing unexplained non-bloody diarrhoea that persists beyond the acute setting. In this context, the term 'unexplained' refers to a patient without apparent alarm features and where initial consultations have failed at making a diagnosis. We used an evidence-based approach and included aspects predominantly based on clinical experience when appropriate.

Children and adolescents with chronic diseases requiring lifelong care face unique challenges that affect their daily lives and those of their families. Initially, these patients receive specialized care in pediatric facilities, where parents play a key role in treatment decisions. However, transitioning to adult healthcare facilities is inevitable, and this process, recognized as crucial years ago, involves moving adolescents with chronic conditions from child-centered to adult-oriented care. This transition can be complicated by varying age limits for pediatric care and the scarcity of adult care centers with specific expertise. The transition often requires cooperation between different centers or even countries due to patient mobility. The transition phase is critical, as it can lead to loss of follow-up, treatment suspension, and increased risks of complications or disease relapse. Beyond medical management, various factors influence the long-term prognosis of chronic conditions, making a well-organized transition program essential. While many hospitals have implemented transition models with mixed results in satisfaction, disease control, and follow-up adherence, there are frequent shortcomings in the process. This Mistakes In article will outline eight common mistakes made during the transition from pediatric to adult care, supported by literature and professional experience.