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I don't know why for sure, but I do this a lot, especially when relaxing, sleepy, resting. Sometimes it is very forceful. I can feel them coming on, a tension that culminates with forceful exhalation. Hiccups are a muscle spasm of the diaphragm, causing quick inhalation. I think the reverse hiccup is muscle spasm of the rectum abdominus one of the belly muscles causing quick EXHALATION of air.

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14y ago

What else can I help you with?