Joud Hajjar, MD, MS


  • Texas Medical Center



Adult Allergy and Immunology
Allergy and Immunology

Phone: 832-824-1319
Fax: 832-825-1260

Contact Information

6701 Fannin Street
9th Floor
Houston, TX 77030
United States

Clinic Chief, Adult Allergy and Immunology

Texas Children's Hospital

Assistant Professor of Medicine, Baylor College of Medicine


School Education Degree Year
Baylor College of Medicine masters Masters of Science in Clinical Investigations 2017
Virginia Commonwealth University fellowship Allergy and Immunology 2013
University of Texas MD Anderson Cancer Center fellowship Hospice/Palliative Care 2011
Indiana University School of Medicine residency Internal Medicine 2010
American University of Beirut residency Internal Medicine 2007
University of Aleppo medical school Doctor of Medicine 2004


I'm trained Internal Medicine as well as Allergy and Immunology. I have launched the transition program for adolescents and young adults with primary immunodeficiency disorders at Texas Children's Hospital to transition those individuals into adult care.

My clinical interest is in primary immunodeficiency disorders, mast cells and eosinophils disorders.

My research is focused on improving Quality of life and clinical outcomes of patients with primary immunodeficiency disorders.

My philosophy is to take personal responsibility in giving our patients and families the best care that is supported by the highest order of compassion, innovation, and science. And to strive to provide our patients the highest quality of health care that will improve both their health and overall wellbeing.

Selected Publications

Hajjar J, Habra MA, Naing A. Metformin: an old drug with new potential. Expert Opinion on Investigational Drugs 2013 Dec;22(12):1511-7. doi: 10.1517/13543784.2013.833604. Epub 2013 Aug 26. Review. PMID: 23978196 [PubMed - indexed for MEDLINE].

Patient & Family Comments