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Puking or emesis is most commonly known as vomiting and is the process of force expulsion of the foods or contents that are present in one's bowel, which generally comes out through the mouth and sometimes even the nose. The cause of vomiting are vast and varied and can range from reasons like, food poisoning, gastritis, brain tumors, and various other reasons...

It is generally thought that a desire to eat chalk is an indication of a calcium deficiency, so it is advisable that you visit a doctor for a check up as soon as possible. A calcium deficiency is not a medical emergency or even close to it, but it can certainly cause a lot of problems in the long run, and it is better to get it addressed as soon as possible, especially since the problem can be solved quite easily...