A woman aged 21 years underwent a diagnostic laparoscopy and appendicectomy for undifferentiated abdominal pain. She re-presented two days later with persistent fever, ongoing abdominal pain, vomiting and anorexia. At admission she was noted to be profoundly hypophosphataemic (0.21 mmol/L) with a normal corrected calcium (2.14 mmol/L). On further questioning, it was revealed the patient had received an iron carboxymaltose infusion two weeks prior from her general practitioner