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.
Coughing drives fast-moving air from the lungs, which causes your airways to vibrate. This vibration loosens the mucus thatâs stuck to the mucus membranes in your airways. Coughing propels this mucus upwards and out of your airway.