You should see a doctor if the hiccups become chronic and persistent (if they last more than 3 hours), or if they affect your sleeping patterns or interfere with eating.
A case of the hiccups is rarely a medical emergency. If your hiccups last for more than 3 hours, occur with severe abdominal pain, or you spit up blood, however, you should seek medical attention.
Who knew? ♥
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Haha I remember looking this up on google when I couldn't stop my deng hiccups. :]