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有一部分人咳后若吐痰不方便，就把它咽进肚里。他们认为，痰是自己身上的，咽下去没有什么不好的。其实痰中混有大量的细菌，你把它咽过去，有一部分细菌会被胃酸杀死，但相当的一部分细菌都活下来进入肠道，这就会引起一些肠道疾病。有肺结核的病人咽痰就更加危险。
Some people cough if it is not convenient to spit it, swallow it into the stomach. They think that phlegm is on their own, and that there is nothing wrong with swallowing it. In fact, sputum mixed with a large number of bacteria, you swallow it in the past, some bacteria will be killed by stomach acid, but a considerable part of the bacteria have survived into the intestine, which will cause some intestinal diseases. Pharyngeal sputum in patients with tuberculosis is even more dangerous.