<p>Acute abdomen is a common presentation in the emergency department, requiring prompt evaluation, diagnosis, and treatment. This case report highlights how simple diagnostic tools can facilitate early detection of abdominal pain caused by duodenal perforation—a rare complication in patients with locally advanced pancreatic cancer. We present a novel case of a 62-year-old male with locally advanced pancreatic cancer who developed acute abdominal pain. The diagnosis of intestinal perforation was made at a Specialist Palliative Care clinic within a tertiary cancer centre. An erect abdominal X-ray revealed free air under the diaphragm, pointing to bowel perforation. The patient underwent emergency surgical exploration, which confirmed a duodenal perforation and was managed with a palliative gastrojejunostomy. While point-of-care ultrasound (POCUS) was not used in this case, we emphasize its potential utility as a bedside tool in the emergency setting for early evaluation of acute abdomen. It can aid in differentiating between conditions such as bowel obstruction, perforation, intussusception, abscesses, or large masses compressing vital structures—many of which may not be visible on a plain abdominal X-ray. This case underscores the importance of early clinical evaluation and the use of accessible diagnostic tools (POCUS) in the timely management of acute abdomen, particularly in complex cancer cases.</p>