核心问题
（1）A person who has a disease is ill or sick.
(2) He could not come to the meeting because of illness.
disease 与 illness 都作“疾病”解,不知它们之间有无区别?
词典解答
粗略的说,disease 是指具体的疾病,是可以患上或感染上的:
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She's suffering from a disease of the heart. 她患上了心脏病。
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Many diseases are caused by bacteria. 许多疾病都是由细菌引起的。
而 illness 和 sickness 则是指生病的状态(可数或不可数):
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She was weak from a long illness. 她长期患病之后很虚弱。
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He could not work for a long time because of sickness. 他因病长期不能工作。
但是,有时候 illness 也可指具体的疾病:
Cancer is a serious illness. 癌症是一种很严重的疾病。