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Dr Justin Leong Wen Hao
MBBS, MRCP (UK), MMed (Int Med), ESEGH, GDFM, DWD (CAW)
Associate Consultant
Singapore General Hospital
Specialty: Gastroenterology
Conditions Treated By This Doctor
Acute ＆ Chronic Viral Hepatitis
Coeliac Disease
Colonic Polyps
Colonoscopy
Colorectal Cancer Screening
Crohn's Disease
Gastro-Oesophageal Reflux (GERD)
Gastroscopy
H. Pylori Infection
Hepatitis A
Hepatitis B
Inflammatory Bowel Disease
Liver Cirrhosis
Microscopic colitis
Stomach Cancer Screening
Ulcerative Colitis
Clinical Interests
Diagnostic and Therapeutic Endoscopy,
Gastroenterology,
Hepatology,
Inflammatory Bowel Disease
About Doctor
Dr Justin Leong Wen Hao is a gastroenterologist at Singapore General Hospital with subspecialty interests in inflammatory bowel disease (IBD). He graduated from the Yong Loo Lin School of Medicine, National University of Singapore, and subsequently obtained MRCP (UK), Master of Medicine (Internal Medicine, Singapore), and the Graduate Diploma in Family Medicine. He completed his specialist training in Gastroenterology and Hepatology at SingHealth.
His practice focuses on the management of inflammatory bowel disease and complex gastrointestinal conditions. In addition to his clinical work, Dr Leong is actively involved in research, medical education, and quality improvement, with a particular interest in advancing more effective, patient-centred models of gastrointestinal care.
Languages Spoken
- English
- Chinese
Education and Training
- Master of Public Health (MPH), Candidate, London School of Hygiene and Tropical Medicine
- European Specialty Examination in Gastroenterology and Hepatology (ESEGH)
- MRCP (UK)
- Master of Medicine (Internal Medicine), Singapore
- Graduate Diploma in Family Medicine (GDFM)
- Designated Workplace Doctor (Compressed Air Works) (DWD)
- Bachelor of Medicine, Bachelor of Surgery (MBBS), Yong Loo Lin School of Medicine, National University of Singapore
Professional Appointments and Committee Memberships
- Member, Gastroenterological Society of Singapore (GESS)
- Member, European Crohn’s and Colitis Organisation (ECCO)
- Member, Gastroenterology Specialty SCCR EPIC Workgroup, Division of Medicine, Singapore General Hospital (2024 – Present)
- Member, SingHealth Collaborative Content Review (Gastroenterology Speciality Workgroup)
- Member, Gastroenterology - General Practitioner Telegram Advice Group, Division of Population Health and Integrated Care, SingHealth (2025 – Present)
- Member, Medisave Audit Committee, Department of Gastroenterology and Hepatology, Singapore General Hospital (2024 – Present)
Publications
- Y Y Tan, E H T Cheong, C T Lim, S Cai, SW Tay, JWH Leong, E Salazar, L T E Cheng, A S C Low, M T K Tan. Clinical and environmental impact of intestinal ultrasound for inflammatory bowel disease: a tertiary centre experience in Southeast Asia. Scandinavian Journal of Gastroenterology. July 2025. DOI: 10.1080/00365521.2025.2533338
- L White, MTK Tan, JWH Leong. Chapter 50: Inpatient Care. 2025. Inflammatory Bowel Disease Nursing Manual. DOI: 10.1007/978-3-031-87503-8_51.
- JWH Leong, L Yang, KKJ The, WL Liou. An Unusual Cause of Massive Per Vaginal Bleeding. ACG Case Rep J. 2024. October 2024. 11(10):p e01496.
- JWH Leong, ZH Yan, FJ Foo, FHX Koh, LTE Cheng, SC Kong, TT Tey. Hyperbaric Oxygen Therapy Achieved Fistula Healing in a Young Patient with Severe Refractory Perianal Crohn’s Disease. Cureus June 2024. 16(6): e62987. doi:10.7759/cureus.62987
- Jiang, Bochao MBBS, MRCP; Dorosan, Michael MSc; Leong, Justin Wen Hao MBBS, MRCP; Ong, Marcus Eng Hock MBBS, MPH; Lam, Sean Shao Wei PhD; Ang, Tiing Leong FRCPEd, FAMS. Development and validation of a deep learning system for detection of small bowel pathologies in capsule endoscopy: a pilot study in a Singapore institution. Singapore Medical Journal 65(3):p 133-140, March 2024. | DOI: 10.4103/singaporemedj.SMJ-2023-187
- JWH Leong, LM Wang, JWQ Li, TL Ang, BEA Kwek, JPL Ong. Cronkhite Canada Syndrome Masquerading as Inflammatory Bowel Disease. ACG Case Rep J. 2023 Sep 5;10(9):e01090. doi: 10.14309/crj.0000000000001090. PMID: 37674882; PMCID: PMC10479349.
- Leong WHJ, Tan XHA, Salazar E. More than Pus - Primary Hepatic Epithelioid Angiomyolipoma Masquerading as Liver Abscess. Case Rep Gastroenterol. 2021;15(1):1-8. Published 2021 Jan 8. doi:10.1159/000511886
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