A medical clinic located in Ashburn, VA that specializes in allergic disorders. Dr. Jiun Yoon is a Accepting New Patients of All Ages!!
03/16/2026
Weather updates:
The clinic will close at 3 PM with last allergy shots at 2:30 PM on Monday, March 16th, due to the potential for severe thunderstorms and tornadoes this afternoon.
Send a message to learn more
03/09/2026
Spring Pollen is BACK!!
Now that the weather is warming up, the trees are taking advantage of the sun, warmth, and breezes to spread their pollen everywhere.
Allergy sufferers are feeling the effects of the pollen. Runny noses, sneezing, nasal congestion, post-nasal drip, itchy throat, nose, and watery eyes are all symptoms caused by Spring tree pollen. Symptoms start in February/March and last through the end of April or the beginning of May. For grass and w**d pollen sufferers, those symptoms can persist in the Summer and Fall months.
Medications that can help are available over the counter, including oral antihistamines, nasal steroid sprays, and eye drops.
Some patients may need additional treatment options, especially if the medications are ineffective, if they are intolerant to medications, or if they prefer longer-lasting treatment.
We offer evaluation and testing for environmental allergies and treatment options, including maximizing and optimizing available medications and desensitizing patients with individualized treatments called aeroallergen immunotherapy or "allergy shots."
The clinic will be CLOSED on Monday, January 26th, due to the weather. Currently, plans are to open as scheduled on Tuesday at 7:30AM, but that may change based on weather and street conditions.
01/22/2026
We are monitoring the forecasts for the impending winter storm on Sunday. We may close the clinic on Mon. Jan. 26th. If you have an appointment and would like to reschedule, please call the clinic at (571) 246-6323.
10/29/2025
Make that 6 years in a row that Ashburn Allergy has been selected by its peers for Northern Virginia Magazine's Top Doctors List!
09/04/2025
We have the 2025-26 Flucelvax Trivalent Influenza Vaccine.
06/30/2025
Friendly reminder:
We are closed this Thursday and Friday, July 3rd and 4th.
Additionally, the clinic will be closed the week of Monday, July 21st, through Friday, July 25th, except on Thursday, July 24th.
Send a message to learn more
06/04/2025
Friendly reminder that we will be CLOSED on Friday, June 6th, and Monday, June 16th.
Send a message to learn more
03/31/2025
Spring Pollen is HERE!!
Now that the weather is warming up, the trees are taking advantage of the sun, warmth, and breezes to spread their pollen far and wide.
Allergy sufferers are feeling the effects of the pollen. Runny noses, sneezing, nasal congestion, post-nasal drip, itchy throat, nose, and watery eyes are all symptoms caused by Spring tree pollen. Symptoms generally start in February/March and last through the end of April or the beginning of May. For grass and w**d pollen sufferers, those symptoms can persist into the Summer and Fall months.
Medications that can help are generally available over the counter now, including oral antihistamines, nasal steroid sprays, and eye drops.
Some patients may need additional treatment options, especially if the medications are ineffective, if they are intolerant to medications, or if they prefer longer-lasting treatment.
We offer evaluation and testing for environmental allergies and treatment options, including maximizing and optimizing available medications and desensitizing patients with individualized treatments called aeroallergen immunotherapy or "allergy shots." Call (571) 246-6323 for an appointment. www.ashburnallergy.com
02/25/2025
Reminder: The clinic will be CLOSED on Friday, Feb. 28th.
Send a message to learn more
02/11/2025
The office will be CLOSED on Wed. Feb. 12th due to the weather.
Send a message to learn more
02/03/2025
Closings reminder: We are CLOSED on Fri., Feb. 7th and Fri., Feb. 28th
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Officially open for patients as of April 9, 2018!!
Welcome to Ashburn Allergy, PLLC. We are a pediatric and adult allergy, asthma, and immunology clinic located in the heart of Loudoun County. We strive to provide the most advanced and comprehensive evaluation and treatment for your entire family. We welcome patients of all ages. Here at Ashburn Allergy, every patient is cared for like family and we want you to be involved in your care and well-being. We use the most current evidence-based medical guidelines and clinically proven state of the art testing and evaluation methods to develop a personalized treatment and care plan individualized to each patient’s needs.
Jiun Yoon, MD started his own solo allergy practice, Ashburn Allergy, PLLC, after eleven years of government service and six years in a group private practice. He served nine years on active duty with the United States Army. During his distinguished nine-year Army career, Dr. Yoon served as a Brigade Surgeon in the 2nd Infantry Division, staff internist with the 8th Army based in Seoul, South Korea, and Chief of the Allergy and Immunology Service at Dwight D. Eisenhower Army Medical Center in Augusta, Georgia; including a deployment in support of Operation Iraqi Freedom with the 10th Combat Support Hospital. After completing his active duty service, Dr. Yoon practiced at the Fort Belvoir Community Hospital as a civilian allergist and also contributed to the education of future allergists at the Walter Reed National Military Medical Center Allergy and Immunology training program. Prior to starting Ashburn Allergy, Dr. Yoon joined a large group allergy private practice in the Metro DC area and served as the lead physician for their hub. He completed his undergraduate training at the University of Michigan in Ann Arbor and earned his Doctor of Medicine from the Drexel University College of Medicine in Philadelphia. He completed his internship and residency in Internal Medicine at Tripler Army Medical Center in Honolulu, HI and fellowship training in Adult and Pediatric Allergy and Immunology at the prestigious Walter Reed Army Medical Center. He is board certified in Allergy/Immunology.
Dr. Yoon's professional career includes appointments on several committees appointed by the American Academy of Allergy Asthma and Immunology (AAAAI) and the American College of Allergy Asthma and Immunology(ACAAI). He has also been elected as a Fellow of both the AAAAI and the ACAAI, as well as the American College of Physicians.
His special interests in the field of allergy and immunology include allergic and non-allergic rhinitis, food allergies, and asthma. His approach to patient care incorporates many aspects of core Army values including integrity, duty, honor, and respect to provide top-notch compassionate and effective care for all ages.
Dr. Yoon grew up in the Washington, DC area and returned to this area upon completion of his military service. He resides in Ashburn, VA with his wife and two children. He enjoys playing and watching a variety of sports, especially the Michigan Wolverines. Go Blue!