Episodes of coughing at night after lying down and hoarseness the following morning are common. Acid reflux: Gastroesophageal reflux disease (GERD) can result in constant coughing due to the backup of acid from the stomach.It is often accompanied by wheezing and chest tightness, but in some people, a cough is the only symptom, and may be referred to as "cough variant asthma." Asthma: Asthma may be a cause of a steady cough.If there is also swelling in the neck or tongue or shortness of breath, this can be a medical emergency ( anaphylactic shock). The cough is often accompanied by wheezing with expiration (breathing out). Bronchospasm: Constriction of the airways ( bronchospasm) due to an allergic reaction or asthma can cause a cough.Allergies: Environmental allergies such as a mold allergy, as well as food allergies, may cause a cough.With chronic bronchitis, the cough is usually productive of phlegm. Bronchitis: Both acute bronchitis and chronic bronchitis can cause someone to cough constantly.The cough may be accompanied by other cold symptoms such as a runny nose, or symptoms of the flu, such as body aches. Viral infections: Infections such as the common cold and influenza are a common cause of a non-stop cough.This cough is often productive of clear to whitish phlegm and accompanied by throat clearing. Postnasal drip: Perhaps the most common cause of a constant chronic cough is postnasal drip due to sinusitis or rhinosinusitis (inflammation of the nasal passages).
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