Typical symptoms of small intestine overgrowth (SIBO) are flatulence, a feeling of fullness after eating, abdominal pain, diarrhea or constipation, greasy stools and food intolerances, especially to fermentable carbohydrates. Systemic symptoms such as tiredness, concentration problems, skin problems or vitamin deficiencies (e.g. vitamin B12) can also occur. As the symptoms are often diffuse, SIBO is frequently overlooked. Anyone who suffers from chronic digestive complaints should therefore consider a check-up for SIBO.