The voice box or larynx is at the base of the throat. The cough reflex resides there and is a protective response to prevent saliva or food from entering the lungs. Anything that irritates the larynx can cause that tickle sensation that leads to a cough with little stimulation. The usual causes of this irritation are acid reflux from the stomach and post nasal drip from allergies. treating both of these will usually eliminate the cough.
For reflux I usually reccomend lelvating the head of the bed 6 inches to prevent relux while sleeping. You should ask your obstetrician if this is OK before you do it. Some allegy medications may help as well but, again, you must get permission from your obstetrician before taking any medications, even over-the-counter ones.
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