In a child who has a normal chest x-ray the most common causes of cough are postnasal drip, chronic sinus problem, heartburn, and asthma. You will need to continue to work with your daughter’s doctor. She may need to have testing done to figure out what this could be and the best treatment. You may want to have your daughter seen by a specialist, such as an allergist or pulmonologist. There could be something else triggering the asthma so that the asthma medicines are not able to control the cough. It is common for allergies, physical activity, and postnasal drip to trigger asthma.
Postnasal drip is drainage from the nose and sinuses dripping down the back of the throat. There could be several reasons for this drainage. One reason is an allergy. A second reason is a non-allergic, non-infectious inflammation in the sinuses that can linger after a cold. A third reason is chronic sinusitis. Postnasal drip can cause a productive cough as a result of irritation of the throat and lungs. You may notice your daughter is always clearing her throat because of mucus in the back of her throat.
The fat content in dairy products can thicken mucus. Generally eating dairy products with less fat content is helpful. Drinking plenty of water will help to thin the mucus so that it moves more easily. As long as your daughter is not on a fluid restriction she should be drinking 6 to 8 8-ounce glasses of non-caffeine fluid daily. Clearing the throat can irritate her throat and make it sore. When she feels the need to clear her throat, have her sip some water to clear the mucus.
An antihistamine can dry up the postnasal drip. However, it may make the mucus thicker and more difficult to move. A decongestant like Sudafed® (pseudoephedrine) can thin the postnasal drip and decrease the swelling so it drains easier. A combination antihistamine-decongestant will do both. Check with her doctor to see which would help her more. Often an antihistamine and decongestant are taken only when the postnasal drip gets bad. It may be more helpful to take the antihistamine and decongestant on a regular basis.
A nasal wash helps remove mucus and germs from the nose and sinuses. This can temporarily decrease the postnasal drip and lessen your daughter’s productive cough. A prescription nasal steroid spray decreases mucus production by decreasing the inflammation of the nose and sinuses. This may prevent the postnasal drip and productive cough. To get the most help from a nasal steroid spray use it after doing a nasal wash. A nasal steroid spray does not provide immediate relief of symptoms. It may require several weeks of routine use to become effective. Sometimes it takes the antihistamine, the decongestant, and the nasal wash followed by the nasal steroid spray ALL used routinely to keep the postnasal drip from bothering her. Please read our Nasal Wash MedFact at http://www.nationaljewish.org/medfacts/nasal.html for more information about this technique. Share this information with your daughter’s doctor to see if she would benefit from this daily treatment.