Q: My 10-year-old has had a persistent cough, post-nasal drip, and green mucus for two months. Should we get an allergy test?
- Myeongchan Kim, MD
- Jun 4
- 3 min read
Updated: Jul 8
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Question:
Hello doctor. My 10-year-old child had a head cold and sore throat in mid-December. They took some cold medicine but then caught the flu and had to be hospitalized. Even after being discharged, the cold symptoms persisted, so we continued taking the prescribed medications.
In early January, my child still had a stuffy nose, phlegm, and a lingering cough. A local ENT doctor mentioned it was due to post-nasal drip. We were prescribed more medication, including antibiotics, because the cough and nasal symptoms were stubbornly holding on. Yesterday, the lingering cough continued. While there wasn't an active runny nose, it sounded very congested, and when I cleared my child's nose, the mucus was pale green.
Since these nasal symptoms are so persistent, would it be better to get an allergy test?
Answer:
Hello! It must be very worrying to see your child suffering from continuous cold symptoms for a couple of months, especially after going through a hospitalization for the flu.
To summarize your current situation, your child has experienced recurring nasal congestion, phlegm, and a lingering cough for about two months. They have been diagnosed with post-nasal drip, and you recently observed pale green mucus. Given that these symptoms have lasted for this duration, it is highly advisable to look for underlying causes beyond a simple, temporary cold.
Here is what I recommend:
Getting an Allergy Test
Yes, an allergy test would be very helpful. Whenever cold-like symptoms persist for more than two months, checking for underlying allergies is a standard and highly recommended next step.
Further Medical Evaluation
The presence of pale green mucus suggests a strong possibility of sinusitis (a sinus infection). During your next clinic visit, your doctor may recommend:
A sinus X-ray or CT scan to check for chronic or acute sinusitis.
An allergy blood test or skin prick test to identify potential triggers.
An evaluation for asthma, as the lingering cough could be a related symptom.
Home Care You Can Start Now
Saline Nasal Rinses: Wash your child's nasal passages with a sterile saline solution 2 to 3 times a day to help clear out thick mucus.
Use a Humidifier: Maintain your indoor humidity levels between 40% and 60% to keep the airways moist.
Elevate the Head: Propping up your child's pillow slightly during sleep can help minimize the discomfort of post-nasal drip.
When to Follow Up:
Please make sure to have your child re-evaluated by a doctor if:
The pale green mucus persists or worsens.
Your child develops a new fever or complains of facial pain/pressure.
There is no noticeable improvement even after completing a full course of antibiotics.
Two months is a considerable amount of time for a child to be dealing with these symptoms. I strongly recommend visiting your pediatrician or an ENT specialist for a thorough, in-person examination. If allergies or a sinus infection are the root cause, identifying and treating them properly will bring your child significant relief!
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
