About Dr Nan Yaw Wong

Training and Education

Dr Wong Nan Yaw specialises in Colorectal Surgery and General Surgery after graduating from National University of Singapore (NUS) in 1993 and subsequently working at the National University Hospital (NUH) and Singapore General Hospital (SGH).

In 1999, Dr Wong obtained the Fellowship by the Royal College of Surgeons in Edinburgh then proceeded to win awards from the Royal Infirmary in Yorkshire, and the Weill-Cornell Medical College in New York City.

Professional Interests

After receiving his official qualification as a laparoscopic colorectal surgeon in 2003, Dr Wong Nan Yaw sees cases such as colorectal cancers, colonoscopy screening for cancer, performing minimally invasive surgery, and managing colorectal diseases like hemorrhoids and fistulas. He has also conducted general surgeries including gallstones and abdominal wall hernias. His practice mainly revolves around the treatment of cancerous and non-cancerous conditions of the intestines, rectum, and anus.

Outside of work, Dr Wong regularly goes on mission trips, including the humanitarian earthquake medical relief effort in Taiwan, ROC in 1999.

Contact Dr Nan Yaw Wong

Phone: 67386020


  • MBBS (S’pore)
  • FRCS (Edin)
  • FAMS (General Surgery)

Awards and Achievements

  • Dr Wong Nan Yaw was conferred a medal for his contribution to the humanitarian earthquake medical relief effort in Taiwan, ROC in 1999

Dr Nan Yaw Wong offers the following treatments

  • Colorectal surgery

Recent Answers

Is surgery the only option if I have gallstones that are causing pain?

Symptomatic gallstone is an indication for surgery. There have been attempts in the past to blast the stones with shock wave therapy and also melt the stones using special enzymes, but the recurrence rate was very high. Enzyme therapy is also very expensive and in the long term will cost more than surgery. Laparoscopic gallstone surgery is safe in trained hands and can even be done as a day procedure. Talk to your surgeon about it.

Photo of Dr Nan Yaw Wong

Answered By

Dr Nan Yaw Wong

Colorectal Surgeon

What is recovery like after rubber band ligation for hemorrhoids?

Rubber band ligation is done as an office procedure and without needing any kind of sedation. Through a proctoscope, the applicator ties the rubber band around the pedicle of the haemorrhoids. Up to 3 haemorrhoids can be tied at one sitting. There is some mild discomfort during the procedure but no pain. After the procedure, the patient may experience a sensation of wanting to pass motion, but this is transient and lasts for a couple of hours. Defecation can occur normally after rubber band ligation but some bleeding may occur as the haemorrhoid shrinks and sloughs off after a few days.

Photo of Dr Nan Yaw Wong

Answered By

Dr Nan Yaw Wong

Colorectal Surgeon

Can changes in stool shape and size be a cause of concern?

Change in stool caliber and consistency can be due to a narrowing in the anus or rectum. Patients who had haemorrhoid surgery done may develop narrowing of the anus and pass narrow caliber stools. The most sinister cause would be a narrowing of the rectum or descending colon due to an inflammatory or malignant process. In older patients, these symptoms should never be taken lightly and a diagnostic colonoscopy would be the obvious next step. At 25 and assuming no family history the odds of it being cancer is low, but not zero.

Photo of Dr Nan Yaw Wong

Answered By

Dr Nan Yaw Wong

Colorectal Surgeon

Recent Sessions

Colorectal Surgery & Colon Cancer

Dr Wong is a certified specialist colorectal and general surgeon. He obtained his basic medical degree from the National University of Singapore Faculty of Medicine in 1993. Since graduation, he has worked and trained in the largest and busiest Tertiary Hospitals in Singapore, including National University Hospital and Singapore General Hospital.

He obtained his Fellowship with the Royal College of Surgeons in Edinburgh in 1999, and was accepted in the internationally renowned Department of Colorectal Surgery in Singapore General Hospital as a surgical trainee. He was granted two overseas training awards : one in the United Kingdom at the busy Royal Infirmary in Yorkshire, and another at the Weill-Cornell Medical College in New York, USA. He qualified as a fully trained laparoscopic colorectal surgeon in 2003.

Dr Wong’s specialist interest is in colorectal cancers. Beyond colonoscopy screening for early colorectal cancer, he also performs Minimally Invasive Surgery for excellent surgical outcome. He offers the latest and most advanced techniques in management of benign colorectal diseases like haemorrhoids and fistulae. He also performs standard general surgical operations like laparoscopic gallbladder and hernia surgery.

Dr Wong is also a faculty member of the Asian Endosurgery Task Force, where he helps train the next generation of laparoscopic surgeons.



3 Mount Elizabeth Mount Elizabeth Medical Centre Singapore 228510

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Background Check


No Singapore Medical Council Disciplinary Tribunal actions found for the years we collect data.

* This profile has been last updated on August 26, 2020.