Chronic Bronchitis: This condition is characterized by a persistent cough that brings up mucus, often worse in the morning. Although it's more common in smokers, nonsmokers can also develop chronic bronchitis due to exposure to air pollutants, dust, or other irritants.

Asthma: Morning cough can be a symptom of asthma, especially if it's associated with wheezing, shortness of breath, or chest tightness. Asthma can be triggered by allergens, exercise, or respiratory infections.
Allergic Rhinitis: Postnasal drip from allergic rhinitis can cause a morning cough, as mucus drips down the back of the throat during the night and is coughed up in the morning.
Gastroesophageal Reflux Disease (GERD): Stomach acid reflux can irritate the throat and airways, leading to a morning cough. This is often accompanied by heartburn or a sour taste in the mouth.
Upper Respiratory Tract Infections: Viral or bacterial infections such as the common cold or sinusitis can cause a productive cough, which may be worse in the morning due to mucus accumulation overnight.

Pulmonary Embolism: Although less common, a pulmonary embolism can cause a sudden onset of cough, which may be productive. This is a life-threatening condition that requires immediate medical attention.
Tuberculosis: A chronic cough that is productive, especially if accompanied by weight loss, fever, or night sweats, could be indicative of tuberculosis. This diagnosis is critical to consider, especially in individuals who have been exposed to TB or have compromised immune systems.
Lung Cancer: While less likely in a nonsmoker, lung cancer can still occur and may present with a persistent cough. It's essential to investigate further if other risk factors are present or if the cough is accompanied by other concerning symptoms like unexplained weight loss or hemoptysis.

Cystic Fibrosis: This genetic disorder leads to the production of thick, sticky mucus that can cause a chronic, productive cough. It's more commonly diagnosed in childhood but can be considered in adults with persistent respiratory symptoms.
Bronchiectasis: A condition characterized by damaged airways, leading to a chronic cough with large amounts of mucus production. It can be due to various causes, including infections, autoimmune disorders, or genetic conditions.
Sarcoidosis: An inflammatory disease that can affect the lungs, causing cough, among other symptoms. It's less common but should be considered in the differential diagnosis of a chronic cough, especially if accompanied by other systemic symptoms.