A 21-year-old male came with complaints of abdominal pain, vomiting for 1 day following exertion in a 3000 m race. Routine laboratory investigations revealed deranged creatinine. However, serum uric acid (UA) levels were relatively normal. The patient was adequately hydrated, and input and output was monitored. His renal function tests were monitored daily and creatinine gradually normalised. The 24 h UA levels were done which was relatively normal, but the fractional excretion of UA was 220%. The patient gave a history of similar episode 3 years back which showed similar raised creatinine levels and normal UA. A diagnosis of idiopathic renal hypouricaemia precipitating exercise-induced acute kidney injury was made. The patient has been advised to avoid excessive exercise and asked to come for follow-up once yearly. [ABSTRACT FROM AUTHOR]