Summary: Functional gastrointestinal disorders (FGID) are a wide range of diseases, or rather, ailments that are not caused by any organic or metabolic damage to the gastrointestinal tract. Its pathomechanism is very complex, although currently it is based on the disfunction in the the brain-gut and gut-brain axis. Not without significance are genetic and environmental factors and the currently emphasized intestinal dysbiosis, regardless of its complex causes, as well as past intestinal infections, including COVID-19. One of many such ailments is irritable bowel syndrome (IBS). The treatment of IBS due to this complex pathomechanism is multidirectional and includes dietary (FODMAP diet), psychological (parental counseling and education, cognitive-behavioral therapy, acupuncture, hypnosis) and drugs from very different groups such as herbal, antispasmodics, psychotropics, probiotics, antibiotics (e.g. rifaximin), antidiarrheal (e.g. loperamide), anti-constipation (especially macrogols) and fecal microbiota transplantation (FMT). An interesting, relatively new, adjuvant product is colloidal silicic acid with a multidirectional effect, as it protects the gastric and intestinal mucosa, binds toxins, pathogens and irritants and removes them naturally from the digestive tract. Most importantly, it is a safe product. The review includes all the pros and cons of using specific procedures in IBS in children and adolescents.