Gastroenteritis is a painful illness in which your stomach and your intestines become swollen and angry at the same time. You may vomit, you may have diarrhoea (watery poo), and you usually get cramps in your belly; sometimes there is a little fever too.

Gastroenteritis腸胃炎 is是 a painful illness一種痛苦的疾病 in which your stomach and your intestines你的胃和腸子 become swollen and angry at the same time同時腫脹發炎。 You你 may vomit可能會吐 you may have diarrhoea可能會拉肚子 (watery poo)（水便） and而且 you usually get cramps in your belly通常肚子還會絞痛 sometimes有時候 there is a little fever too也會有一點發燒

Doctors and hospital notes use this long word. Everyday people more often say a stomach bug, or, loosely, stomach flu — though actually it is not the flu at all, which is a different virus in your nose and chest.

Doctors and hospital notes醫生和醫院病歷 use this long word會用這個長長的字。 Everyday people一般人 more often say比較常說 a stomach buga stomach bug or, loosely或籠統地說 stomach flustomach flu though actually不過其實 it is not the flu at all這跟flu完全不同 which is a different virus flu是另一種病毒 in your nose and chest在你鼻子和胸腔裡

A lot of cases come from a virus you catch from other people; some come from food or water that had bacteria in it, which people then call food poisoning.

A lot of cases come from a virus很多病例是病毒引起的 you catch from other people從別人身上感染到的 some come from food or water有些則來自食物或水 that had bacteria in it帶有細菌的 which people then call food poisoning這種情況大家會叫它食物中毒

It is a formal medical noun. It often lasts a few days. The real danger, especially for small children and older people, is losing too much water.

It它 is是 a formal medical noun一個正式的醫學名詞。 It它 often通常 lasts a few days會持續幾天。 The real danger真正的危險 especially for small children and older people尤其對小孩和年長者來說 is是 losing too much water流失太多水分