The following potential cause of hiccups is hyponatremia.
Hiccups are caused by involuntary contractions of the diaphragm the muscle that separates the chest from the abdomen and plays an important role in breathing. This involuntary contraction causes the vocal cords to close very briefly producing characteristic hiccups.
Irritation can also be caused by breast or throat cancer. Rarely, hiccups may be associated with brain disorders such as tumors or stroke, or with cardiovascular disease. Some drugs can also cause long-term hiccups. Finally, hiccups can persist for no apparent reason. The reason heart problems cause hiccups is in the breathing muscles underneath the heart.
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