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Damage to or irritation of the vagus nerves or phrenic nerves, which serve the diaphragm muscle.Factors that may cause damage or irritation to these nerves include: A hair or something else in your ear touching your eardrum. hope this helps....
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shenu6Hiccups are sudden, involuntary contractions of the diaphragm muscle. As the muscle contracts repeatedly, the opening between the vocal cords snaps shut to check the inflow of air and makes the hiccup sound. Irritation of the nerves that extend from the neck to the chest can cause hiccups.
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hope this helps....