If someone or something is diagnosed as having a particular illness or problem, their illness or problem is identified. If an illness or problem is diagnosed, it is identified. 诊断
verb [vt. 及物动词]诊断(病症);找出原因
Susan had a mental breakdown and was diagnosed with schizophrenia. 苏珊精神崩溃,被诊断为精神分裂。