Acute intermittent porphyria is a rare genetic metabolic disease. In this case, a 38-year-old female patient who experienced recurrent abdominal pain with nausea, vomiting, and diarrhea, following with epileptic seizures and acute respiratory failure. After the laboratory and image examinations, hyponatremia and leukocytosis were only noted without other abnormal findings. Because of brownish urine, further laboratory examinations were performed. High level of aminolevulinic acid and porphobilinogen of urine, and low level of porphobilinogen deaminase of blood were revealed. Acute intermittent purpura was diagnosed eventually. After human hemin treatment, the clinical symptoms gradually improved, and the patient was then discharged. For such patient with abdominal pain, refractory epilepsy, and coexisting hyponatremia, acute intermittent purpura should be considered as differential diagnosis for punctual treatment.