<unk>  is a diffuse sensation of unease and discomfort, often perceived as an urge to vomit. While<unk> ot painful, it can be a debilitating symptom if prolonged and has been described as placing discomfort on the chest, upper abdomen, or back of the throat. Over 30 definitions of<unk>  were proposed in a 2011 book on the topic.<unk>  is a<unk> on-specific symptom, which means that it has many possible causes. Some common causes of<unk>  are gastroenteritis and other gastrointestinal disorders, food poisoning, motion sickness, dizziness, migraine, fainting, low blood sugar and lack of sleep.<unk>  is a side effect of many medications including chemotherapy, or morning sickness in early pregnancy.<unk>  may also be caused by disgust and depression. Medications taken to prevent and treat<unk>  and vomiting are called antiemetics. The most commonly prescribed antiemetics in the US are promethazine, metoclopramide and the<unk> ewer ondansetron. The word<unk>  is from Latin<unk> , from Greek –<unk> , "ναυτία" –<unk> autia, motion sickness, "feeling sick or queasy".
Nausea
Vomiting
Constipation
Flushing 
Fever
Allodynia
Arthralgia
Myalgia