并发症 bìngfāzhèng complications
complications (undesired side-effect of medical procedure)
How to remember 并发症: 并 to combine + 发 send out + 症 ailment = complications.
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How it is used
- A medical complication - a secondary illness triggered by the main one - 糖尿病的并发症 (tángniàobìng de bìngfāzhèng) complications of diabetes.
- Technical medical noun; the 并发 part means 'occurring together/simultaneously'.
- Not a general 'side effect' (that's 副作用, fùzuòyòng, esp. of drugs); 并发症 is a further disease that arises.