Hiccups start much lower in your body, though in the diaphragm, the dome-shaped muscle between your lungs and stomach.
Normally, the diaphragm pulls down when you inhale to let air into your lungs. Then relaxes when you exhale. So air can flow back out of your lungs to exit your nose and mouth.
If a person eats too fast, he or she can swallow air along with food and end up with the hiccups.
Smoking or chewing gum also can cause a person to swallow air. Damage to the vagus or phrenic nerve may cause last long time.
Problems with the liver, including swelling, infection, or masses can cause irritation of the diaphragm, which can cause hiccups
Hiccups are rarely a cause for concern, but if hiccups become frequent, chronic, and lasting more than 3 hours.
If they affect sleeping patterns, interfere with eating, cause reflux of food or vomiting, occur with severe abdominal pain, fever, shortness of breath, spitting up blood, or feeling as if the throat is going to close up, see a doctor.
There are numerous home remedies to get rid of from them. Including holding your breath, drinking a glass of water quickly, having someone frighten or surprise you.