We present a case report of a patient with chronic gastrointestinal symptoms who was referred to the allergologist because of suspected food allergy. In this setting, irritable bowel syndrome, reflux disease, lactose intolerance, food allergy, mastocytic enterocolitis, Crohn's disease and coeliac disease are frequently considered as diagnostic possibilities in young patients. In addition, stool samples may be used to rule out infectious diseases such as salmonella infection. This case proved unusual in excluding all of the aforementioned possibilities and shows the importance of adequate consideration of differential diagnostics if common explanations of chronic gastrointestinal symptoms remain inconclusive.
Keywords: Food allergy, fluconazole, chronic gastrointestinal symptoms, HIV-infection