Vomiting is forcing the contents of the stomach up through the esophagus and out the mouth. It is a forceful action accomplished by a fierce, downward contraction of the diaphragm muscle.
At the same time, the abdominal muscles tighten against a relaxed stomach with an open gastroesophageal sphincter. The contents of the stomach are propelled up and out.
As part of a bodily reflex, you can produce more saliva just before vomiting.
Vomiting is a complex, coordinated reflex that is orchestrated by the vomiting center of the brain and responds to signals coming from:
-The mouth, stomach and intestines.
-The bloodstream, which may contain medicines or infections.
-The balancing systems in the ear (dizziness).
-The brain itself, including unsettling sights, smells, or thoughts.
An amazing variety of stimuli can trigger vomiting, from migraines to kidney stones. Sometimes, just seeing someone else vomit will start you throw one in a body’s effort to protect it from possible exposure to the same danger.
Most of the time, nausea and vomiting do not require urgent medical attention. However, if symptoms continue for days, they are severe or if you can not keep any food or liquid may have a more serious condition.
Dehydration is a major concern in most episodes of vomiting. The speed with which you become dehydrated depends on the size, frequency of vomiting and also has diarrhea.
Among the causes of vomiting occurs are viral infections, certain medications, migraines, dizziness or motion sickness, pregnancy, food poisoning, food allergies, brain tumors, chemotherapy in cancer patients, bulimia, alcoholism and peptic ulcer at the outlet of the stomach.