Eosinophilic cystitis is an inflammatory disorder of the urinary bladder, characterised by irritative voiding symptoms, negative urine cultures, and eosinophilic infiltration of the bladder wall. Since 1960 only about 20 cases have been described in the English scientific reports, making it a rather rare entity. In children the disease appears to be shortlived and self-limited, requiring no specific treatment. We present a case with a 7.5-year-old boy, who experienced spontaneous remission of all symptoms, following an acute attack of eosinophilic cystitis.