This study aims to prove the efficacy of electroacupuncture (EA) for pain relief in patients with acute pancreatitis compared with conventional treatment. Patients diagnosed with acute pancreatitis will be enrolled after obtaining informed consents. They will be randomly assigned to EA 1, EA 2, or control group in a 1:1:1 ratio. All the enrolled patients will basically receive the conventional standard-of-care therapy for acute pancreatitis. Local electroacupuncture will be given in group EA 1, while local with distal electroacupuncture will be given in group EA 2, additionally. For the conventional therapy, first non-steroidal anti-inflammatory drugs will be administered; afterwards, if inadequately controlled, low-potency narcotic analgesics such as codeine and then high-potency narcotic analgesics such as morphine or meperidine will be given sequentially as required. The patients randomized to the EA 1 and 2 groups will undergo 1 session of electroacupuncture daily from day 1 until day 4, or until pain is resolved. The primary endpoint is the visual analogue scale (VAS) for pain on day 5. Secondary endpoints include daily VAS, requirement of analgesics, changes of inflammatory markers, and hospital days.