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About Dr Q M LEONG


Colorectal & Hernia Surgeon in Singapore

Dr Leong is a hernia and colorectal surgeon in Singapore who graduated from the University of London in 2000. He obtained his membership to the Royal College of Surgeons of Edinburgh in 2003 and started working in Tan Tock Seng Hospital in 2003. He started his Advanced Specialist Training in 2005 and passed his fellowship exams in 2008. Dr Leong was awarded the prestigious MOH HMDP scholarship to train under Prof Kim Seon Hahn in Korea University for Laparoscopic and Robotic colorectal surgery in 2010.

Dr Leong is amongst a handful of hernia and colorectal surgeons in Singapore who practice Single Incision Laparoscopic surgery. This is a technical and complex procedure that is minimally invasive, speeds up recovery, and confers excellent cosmetic results. Dr Leong also routinely trains basic and advanced specialist trainees in laparoscopic surgery, and regularly proctors consultant surgeons in complex colorectal cases. 

Beyond laparoscopic surgery, Dr Leong also performs a repertoire of minimally invasive General Surgery procedures. He is also an experienced endoscopist with more than 10000 procedures, performing diagnostic and therapeutic scopes for elective and emergency surgical conditions. He performs direct access colonoscopies and oesophago-gastro-duodenoscopy for patients and will strive to perform the procedures on the same day if possible for patients’ convenience.

Colorectal Surgeon in Singapore Dr Leong

Areas of Expertise

Colorectal surgery refers to a group of surgical procedures to repair damage to the colon, rectum, and anus, as a result of various injuries or diseases. As an experienced colorectal doctor in Singapore, we will accurately diagnose your symptoms before strategically determining the most ideal procedure for your condition.

At Advanced Colorectal And General Surgery, we offer advanced surgical procedures and are committed to providing the utmost in treatment and patient care. Click on each section to learn more about its symptoms and our available treatment options.


Haemorrhoids (Hemorrhoids)

Hemorrhoids (Piles) are swellings containing enlarged blood vessels found inside or around the rectum and anus. And can cause itchiness, bleeding, and discomfort.

Colorectal Cancer

Colorectal Cancer

Colorectal cancer occurs in the colon or rectum region, and often exhibits little symptoms until advanced stages. Arrange for a colonoscopy at our Singapore clinic for early detection and treatment.



Gallstones likely form as a result of an imbalance in the chemical make-up of bile in the gallbladder, and can cause significant pain. Visit our colorectal doctor in Singapore for prompt treatment.

Peptic Ulcer Disease

Peptic Ulcer Disease And Gastritis

Peptic ulcers and gastritis are the most common digestive problems in Singapore. Chronic vomiting and abdominal disconformort are some of the common symptoms.

Anal Fissures

Anal Fissures

An anal fissure is a small tear in the lining of the anal canal, and can be caused by hard, dry bowel movement or loose, frequent bowel movements. They can result in sharp pain and bleeding.

Anal Fistulas/Perianal Abscesses

Anal Fistulas/Perianal Abscesses

Perianal abscesses are painful swellings near the anus, and can result in anal fistulas, which are small tunnels that form between the end of the rectum and the skin near the anus.



A hernia occurs when an internal part of the body pushes through a weakness in the muscle wall. It can potentially be life-threatening, and requires surgery by a colorectal doctor in Singapore.

Skin Lumps​

Lipoma And Sebaceous Cyst (Skin Lumps)

Two common types of skin lumps are lipomas, which are soft, fatty lumps that grow under the skin; and sebaceous cysts, which are sebum-filled lumps that also grow under the skin.

Screening for Colorectal Cancer

Colonoscopy Screening
For Colorectal Cancer
(Same Day Colonoscopy)

We offer Same Day Colonoscopy at our clinic in Singapore, where consultation and procedure take place within the same day, providing patients with greater ease and comfort.

Diverticular Disease

Diverticular Disease​

Diverticula are small bulges or weaknesses that can develop in the lining of the colon with age, and may require surgery in serious complications or when diverticulitis (inflammation) occurs.

Change in Bowel Habit / Constipation​

Change in Bowel Habit / Constipation​

A change in bowel habits can be seen in stool colour, consistency (degree of firmness), and frequency. They may signify the presence of a serious underlying medical condition.