Hepatitis is an inflammation of the liver, most commonly caused by a viral infection. There are 5 main hepatitis viruses, referred to as types A, B, C, D and E. These 5 types are of greatest concern because of the burden of illness and death they cause and the potential for outbreaks and epidemic spread. In particular, types B and C lead to chronic disease in hundreds of millions of people and, together, are the most common cause of liver cirrhosis and cancer.

Hepatitis A and E are typically caused by ingestion of contaminated food or water. Hepatitis B, C and D usually occur as a result of parenteral contact with infected body fluids. Common modes of transmission for these viruses include receipt of contaminated blood or blood products, invasive medical procedures using contaminated equipment and for hepatitis B transmission from mother to baby at birth, from family member to child, and also by sexual contact.

Acute infection may occur with limited or no symptoms, or may include symptoms such as jaundice (yellowing of the skin and eyes), dark urine, extreme fatigue, nausea, vomiting and abdominal pain.

Gānyán shì gānzàng de yánzhèng, zuì chángjiàn de yuányīn shì bìngdú gǎnrǎn. Yǒu 5 zhǒng zhǔyào gānyán bìngdú, chēngwéi A,B,C,D hé E-xíng. Zhè 5 zhǒng lèixíng zuì yǐnrénguānzhù, shì yóuyú zàochéng de jíbìng fùdān hé sǐwáng qíngkuàng yǐjí yǐnfā de yìqíng hé chuánbō. Yóuqíshì B hé C-xíng shǐ shù-yì rén líhuàn mànxìngbìng, èrzhě shì gānyìnghuà hé gān'ái de zuì chángjiàn yuányīn.

A hé E-xíng gānyán tōngcháng shì shèrù wūrǎn de shíwù huò shuǐ zàochéng. B,C hé D-xíng gānyán tōngcháng tōngguò fēichángdào tújìng jiēchù shòugǎnrǎn tǐyè chuánrǎn. Zhèxiē bìngdú zuì chángjiàn de chuánbō fāngshì yǒu: Jiēshòu wūrǎn xuèyè huò xuèyè zhìpǐn, yòng wūrǎn de shèbèi jìnxíng qīnrùxìng yīliáo cāozuò, B-xíng gānyán kě chūshēng shí mǔ-yīng chuánbò, yóu jiātíng chéngyuán chuán gěi értóng, huò xìngjiēchù chuánbò.

Jíxìng gānyán kěyǐ méiyǒu zhèngzhuàng huò chūxiàn yǒuxiàn de zhèngzhuàng, rú huángdǎn (pífū hé yǎnjīng fāhuáng), niào-sè biàn-shēn, jídù fálì, ěxīn, ǒutù hé fùtòng.