What causes hiccups?
Hiccups or SDF (synchronous diaphragmatic flutter) are involuntary contractions of the diaphragm. The diaphragm is an involuntary muscle located between the thoracic and abdominal cavities that helps us breathe. The sound of hiccups is caused by a rapid inhalation of air which causes the epiglottis to close rapidly. The epiglottis is an anatomical structure that closes over the trachea and prevents food or fluids from entering the trachea (windpipe).
The exact etiology of hiccups is unknown but predisposing factors may include: obesity, eating or drinking too fast, emotional stress or excitement, gastric bloating, GERD (reflux disease), alcohol ingestion, and consumindg foods that are irritating to the stomach.
Actually, food-pipe and windpipe lie parallel to each other. there's an area where both these pipes share a common passage. here, the inflow of air closes a flap named epiglottis to prevent food from going in the wind pipe and vice versa. hiccups refer to as rapid inhalation of air to stop the food from entering in the wind pipe.
mostly, when u drink or eat too fast, or speak while eating, or consume some allergic food, hiccups occur and stop after a while, when the desired work is done.