1
have an illness
常用搭配
She has a serious illness.
她患有一种严重的疾病。
病；疾病；患病
先理解核心含义，再看它在真实句子里的用法。
病；疾病；患病
An instance of disease or poor health; the state of being ill.
She has a serious illness.
她患有一种严重的疾病。
疾病或健康状况不佳的一次发作(事件)。
An instance (episode) of a disease or poor health.
影响生物体部分或全部的正常生理功能的损害
impairment of normal physiological function affecting part or all of an organism
健康不良或疾病的状态。
A state of bad health or disease.
She missed a week of school due to a sudden illness.
她因为突发疾病缺课一周。
The doctor said his illness is not contagious.
医生说他得的病不传染。
After a long illness, he finally recovered.
久病之后，他终于康复了。
常用搭配
She has a serious illness.
她患有一种严重的疾病。
较正式
He suffers from a chronic illness.
他患有慢性疾病。
It took her weeks to recover from the illness.
她花了数周时间才从疾病中康复。
Doctors can treat many illnesses with antibiotics.
医生可以用抗生素治疗许多疾病。
Not this
I caught a disease.
Use this
I caught an illness.
中文里「疾病」可指任何病症，但英语中 disease 通常指具体的、医学上界定的疾病（如心脏病），而普通感冒等小病用 illness 更自然；学习者误将 disease 用于轻微不适，显得夸张。
Not this
He had illness for three days.
Use this
He had an illness for three days.
illness 作可数名词表示「一次生病」时需加不定冠词 an，中文「生病了」可省略量词，但英语中指具体患病期必须使用冠词或复数形式。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
重病
He was diagnosed with a serious illness.
他被诊断出患有重病。
绝症
She spent her final months coping with a terminal illness.
她最后几个月都在与绝症抗争。
精神疾病
Mental illness affects millions of people worldwide.
精神疾病影响着全球数百万人。
慢性病
Living with a chronic illness requires daily management.
患有慢性病需要日常管理。
染上疾病
Travelers are advised to take precautions to avoid contracting an illness.
建议旅行者采取预防措施以避免染上疾病。
从疾病中康复
It took him several months to recover from the illness.
他花了几个月时间才从疾病中康复。
疾病是生命的黑夜，一种更沉重的公民身份。
When facing a serious illness, one must find strength.
面对严重疾病时，人必须找到力量。
我是个数学家，我患有精神疾病。
His illness affected his ability to work.
他的疾病影响了他的工作能力。
Use illness naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
ill是生病的，ness是状态后缀，illness就是疾病状态。记住：ill+ness=疾病。
在日常对话和医学语境中均常使用，是比较中性的词汇
可数表示具体疾病，不可数表示患病状态
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.