Welcome to Our Practice

Welcome to Southwest Gastroenterology, Your Gastroenterologist in Seguin, TX

**Masks are required and only the patient is allowed in the waiting room and exam room**

Welcome! The gastroenterology professionals at Southwest Gastroenterology  are pleased to welcome you to our practice. We want all our patients to be informed decision makers and fully understand any health issues you face. That's why we've developed a website loaded with valuable information about gastroenterology, endoscopy and digestive problems and treatments.

Our website also provides you with the background about our gastroenterologists, staff, office hours, financing policies, appointment procedures, maps, directions to our office in and other useful information. We know how hectic life can be and are committed to making our practice convenient and accessible. And we want you to feel confident that when you choose Southwest Gastroenterology, you're working with professionals who are qualified, experienced and caring.

Please take a few moments to look through this site to get a better feel for Southwest Gastroenterology's capabilities and services. We also invite you to email or call our office at any time to request an appointment or ask any questions. Thank you.

Mission Statement

Our practice is working together to realize a shared vision of uncompromising excellence in gastroenterology.

To fulfill this mission, we are committed to:

  • Listening to those we are privileged to serve.
  • Earn the trust and respect of patients, profession and community.
  • Exceed your expectations.
  • Ensure a creative, challenging and compassionate professional environment.
  • Strive for continuous improvement at all levels.


  • "I'd like for you to meet one of my favorite doctors of all times. Dr. Tony Tsen.

    Dr. Tsen is one of our family doctors. I can honestly say he has played a major part in saving my husband life on more than one occasion. He has also been an active partner in maintaining my dad's health, as well as my own. His wealth of experience has allowed him to handle any problems we have taken to him.

    I am very happy with my choice of my Gastroenterology P.A. Dr. Tony Tsen."
    Madelyn B.
  • "I have been under Dr. Tsen's care since being diagnosed with Ulcerative Colitis in October 1995. Currently, I live in the Houston area, and choose to travel to Southwest Gastroenterology, P.A in Seguin, Texas to be under his care. Dr. Tsen's healthcare has and continues to play a monumental role in my life. Anytime I have a question, Dr. Tsen is attentive, caring, and always prompt with a response. Dr. Tsen is always willing to provide the best care for his patients. Being under Dr. Tsen's care for 24 years, and traveling to do so, is a true testimony to his professionalism."
    - Matthew S.

To Request an Appointment Use Our Easy Online Contact Form

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Our Location

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Hours of Operation

Our Regular Schedule

Southwest Gastroenterology PA


9:00 am-5:00 pm


9:00 am-5:00 pm


9:00 am-5:00 pm


9:00 am-5:00 pm


9:00 am-3:00 pm





To expedite the scheduling process, please update/complete your patient paperwork by clicking online form under the tab New Patients.