Dr Andrew Ong graduated with MBChB (Honours) from the University of Edinburgh and completed his postgraduate degrees in Internal Medicine, MRCP (UK). He then obtained specialist accreditation in the field of Gastroenterology & Hepatology. He completed his fellowship training at Alfred Hospital & Monash University, Melbourne, where he learnt advanced integrated medical, psychological and dietary management of Irritable Bowel Syndrome and other functional gastrointestinal and motility disorders. From this fellowship, he also was trained in intestinal ultrasound and became one of the pioneering gastroenterologists in Singapore to use intestinal ultrasound in the non-invasive evaluation of bowel disorders.

His areas of interest include Irritable Bowel Syndrome, Gastro-oesophageal reflux disease, Pelvic Floor Disorders and Gastrointestinal motility disorders such as swallowing disorders. As such, his practice often includes challenging cases of chronic abdominal pain, constipation and bloating. He runs the Gastrointestinal Function Unit (GIFU) in SGH and is trained to perform oesophageal high resolution manometry, pH studies and anorectal manometry studies.

He has a particular interest in medical education and has received several teaching awards for his contribution to medical education. He was previously the Associate Programme Director in SingHealth Internal Medicine Residency programme from 2017 to 2019, and is currently the Programme Director of Singhealth Gastroenterology Residency Programme. His other leadership positions include Deputy Director, Faculty Development, Singhealth Medicine Academic Clinical Program and he serves as a part time consultant for faculty development to Ministry of Health, Singapore.