Nathan Smallwood, M.D.

Colorectal Surgeon

1615 North US Highway 75 Ste. A

Sherman, TX 75090

Open today 8 AM - 2 PM
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Quick Facts

  • Board Certified in Colon & Rectal Surgery & General Surgery
  • Currently Accepting New Patients
  • Most Insurance Plans Accepted
  • Performs Colonoscopies
  • Infusion Services Available

GI Alliance - Sherman Endoscopy Center

Gastroenterology in Sherman, TX

GI Alliance - Sherman Endoscopy Center

1615 North US Highway 75

Ste. A

Sherman, TX 75090

Open today 8 AM - 2 PM


GI Alliance - Sherman, TX

Gastroenterology in Sherman, TX

GI Alliance - Sherman, TX

1615 North US Hwy 75

Ste. A

Sherman, TX 75090

Open today 8 AM - 2 PM

About Nathan Smallwood, M.D.

Dr. Smallwood is a board-certified Colon and Rectal Surgeon. He performs anorectal procedures for hemorrhoids, fissures and fistulas. He performs diagnostic and therapeutic colonoscopies and is one of the few physicians in the U.S. to have experience in using endoluminal vacuum therapy to treat anastomotic leaks. Dr. Smallwood has had an extensive experience with the da Vinci® Robotic System for both benign and malignant colon and rectal procedures. He specializes in sphincter sparing resections for rectal cancer including transanal total mesorectal excision (TaTME). He has experience in managing constipation, rectal prolapse, and the treatment for fecal incontinence with the sacral nerve stimulator. He is a member of the American Board of Surgery and the American Society of Colon and Rectal Surgeons.

Why did you choose to specialize in colorectal surgery?

Having the opportunity to positively impact a patient’s life is truly a blessing and is the primary source of joy for me as a surgeon. This is why I especially love Colon and Rectal Surgery. As a Colon and Rectal Surgeon, I can prevent cancer with a colonoscopy or cure cancer with a surgical resection. In benign disease, Colon and Rectal Surgery can dramatically improve a patient’s quality of life. This is especially true for those patients who have had to suffer in silence for months or years due to fecal incontinence or who have an anal fistula, fissure or hemorrhoids.

What do you and your family enjoy doing in your spare time?

My family and I enjoy spending time at my parent’s ranch fishing and feeding the cows. My daughters love to swim, go to the zoo, and before the pandemic, Chuck E. Cheese’s.

Is there a treatment/procedure that you want your patients to know more about?

Bowel incontinence/leakage affects nearly 1 in every 8 adults over the age of 65. There are advanced therapies available that can help reduce the frequency of bowl leakage incidents, which can positively impact anyone’s quality of life and normal activity. It’s important that our patients know there are options to consider. Below are some informative videos that were produced in collaboration with Axonics, my preferred partner for Sacral Neuromodulation Therapy. You can also click here for more detailed information about Axonics Sacral Neuromodulation Therapy.

Awards and Accreditation:

Undergraduate Education:

Texas A&M University

Medical Education:

McGovern Medical School at The University of Texas Health Science Center at Houston

Post-Graduate Training:

Residency & Fellowship – Baylor University Medical Center at Dallas


Board Certified in Colon and Rectal Surgery

Board Certified in General Surgery

Awards and Recognitions:

2008 Alpha Omega Alpha
2010 Highest Intern ABSITE Exam Award
2011 Highest PGY2 ABSITE Exam Award
2012 Highest PGY3-5 ABSITE Exam Award
2014 North Texas Chapter of Colon & Rectal Surgeons, Outstanding Resident Presentation

Professional Affiliations

American College of Colorectal Surgeons

American College of Surgeons


Dr Nathan Smallwood is very thorough kind and patient. I felt very comfortable knowing that he actually "listened " to me as a patient and acknowledged my questions and concerns. I cannot say enough good things about him. He is the only Dr that I know that will give you his cell number after surgery in case you need him. He is also not too proud to request a second opinion before surgery . If I could give him 10 stars or more I would . He is fantastic!!!

C.C. Google

Dr. Smallwood was great from my very first visit. I felt like I was in good hands and he would take care of problems. His after care is second to none. Always available to answer questions and help ease your mind. Thank you Dr. Smallwood for everything you have done for me...Ronnie

R.J. Google

Was highly impressed with the service that Dr Smallwood and his staff provided.

J.S. Google

He did a great job and is always checking on me after the surgery, something majority doctors don't do.

T.M. Google

Every interaction with every person I encountered at TDDC was a very positive one. I would recommend Dr. Smallwood any time. He gave me the best, most personalized care I have ever received from any physician, much less a surgeon. He was genuinely interested in me as an individual, and I felt that he really cared about improving my quality of life, which my surgery did. Desiree Frye, NP also gave me the same kind of genuine concern for my condition prior to my interaction with Dr. Smallwood. This practice’s response to my questions and calls was always the most efficient I have experienced. I cannot imagine better service and care…….Marla St. John

J.S. Google


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