In rare cases, hiccups can last for days, weeks, or months. They most often disappear after a few minutes. Hiccups often start for no apparent reason.It could be because of irregular breathing patterns during the night which causes hiccups to occur more often than usual. The reason dogs get hiccups in their sleep is still not fully understood.Some common causes of hiccups include: Eating too much or too quickly Feeling nervous or excited Stress A sudden change in. That's because the actual irritation happens in the nerve connecting the brain to the diaphragm. Hiccups can happen for a lot of reasons - some of them are physical, and some emotional. Sometimes, hiccups can be a sign of infant GERD (gastroesophageal reflux disease), or acid reflux, where stomach acid flows back up the esophagus. Later on, giggles may bring on the hiccups. They may also simply be yet another in baby's repertoire of reflexes. Hiccups may be brought on by air trapped in little stomachs during a feeding.The spasms caused by the muscle alongside others in the respiratory process lead to the sharp closing of the epiglottis causes the famous 'hic' sound. The diaphragm is a dome-shaped structure that separates the chest and abdominal cavity in humans. Hiccups, also known as hiccoughs, are involuntary sounds made by spasms of the diaphragm.Either way, most people want to get rid of them fast and will try anything to stop their hiccups. This usually lasts a few minutes, but sometimes hiccups can go on for months. Hiccups happen when the diaphragm contracts involuntarily causing your vocal cords to suddenly close and create a hiccupping sound.