Viral infections like a cold or chicken pox can cause inflammation of the airways of the lungs. When this occurs your daughter may have difficulty breathing, especially when she is active or laughs.
After the infection is gone, it is possible for the inflammation to linger. This inflammation can last for several weeks. Sometimes this inflammation may linger for 3 to 6 months. Eventually the inflammation will go away, and then the difficulty breathing will stop. This is called reactive airways disease (RAD) and behaves a lot like asthma. This inflammation often clears more quickly when it is treated with an inhaled steroid medicine like Pulmicort Respules™ (budesonide inhalation suspension), which is given by nebulizer to treat asthma. It may be possible to keep your daughter well and avoid the oral steroids by using the Pulmicort Respules™ (budesonide inhalation suspension) every day. Usually this medicine does not provide immediate relief of symptoms. It may need to be used every day for several weeks to months for it to help. Your daughter’s doctor is the best judge of this.
Asthma is a chronic form of reactive airways disease (RAD). So when this continues, it is generally considered to be asthma. A lung problem such as asthma can cause a cough. A cough can be the only symptom of asthma. It is typical for asthma to be worse at night. Also it is common for infections to trigger asthma. For some people infections are the only thing that triggers their asthma. For other people infections do not trigger their asthma at all. Asthma tends to run in families, but sometimes there is no family history of asthma.
Testing can be helpful to show if this is due to asthma or RAD. Generally testing starts with a simple breathing test called spirometry. This test provides detailed information about how the lungs are working. It will show if there is obstruction in the airways.
For spirometry to be helpful in determining if this is due to asthma or RAD, children need to be able to follow directions well. Generally children need to be at least school age to do this. Until children are old enough to do this testing, they are commonly treated with asthma medicines by nebulizer when they have symptoms and/or to prevent symptoms. So for a 20-month-old this really is a wait and watch situation.
This condition can linger for weeks following a respiratory illness. If it becomes troublesome, causing shortness of breath, moderate wheezing or frequent coughing, it can be treated for a short period of time.