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In an awake person, it would take a severe central nervous system disorder to stop the signal from the brain that makes us all breathe. In a person that is asleep, structures in the nose, mouth, and throat may block the breathing for a short time until the oxygen level in the blood drops and the carbon dioxide builds up in the blood and the person awakens for a few seconds and resumes breathing. This is known as sleep apnea.

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Q: What causes 3 year old to hold breath throughout day unintentionally?
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its when your diaphragm spazzums and you use your diaphragm to breath so if you stop breathing (hold your breath) you should be just fine (:


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