Hypercalcemia can result when too much calcium enters the extracellular fluid or when there is insufficient calcium excretion from the kidneys. Approximately 90% of cases of hypercalcemia are caused by malignancy or hyperparathyroidism.
There are many causes of a productive cough, such as: 1  Viral illnesses. 2  It is normal to have a productive cough when you have a common cold. 3  Coughing is often triggered by mucus that drains down the back of the throat. 4  Infections. 5  An infection of the lungs or upper airway passages can cause a cough.here are many causes of a nonproductive cough, such as: 1  Viral illnesses. 2  Bronchospasm. 3  Allergies. 4  Medicines called ACE inhibitors that are used to control high blood pressure. 5  Exposure to dust, fumes, and chemicals in the work environment. 6  Asthma. 7  Blockage of the airway by an inhaled object, such as food or a pill.
GERD cough could be caused because of factors like the inability of lower esophageal sphincter to work properly. Throwing out gastric acids irregularly from the esophagus due to irregular relaxation of the lower esophageal sphincter may also be a primary factor for Gerd Cough.