想念是一种病，翻译成英语是什么，？

Missing someone is a kind of illness.
Missing someone is a kind of sickness.

动词ing形式作主语，
miss是及物动词，后面必须有宾语，这里由someone来充当，
illness 和 sickness 都可以代表 病

Missing can be a disease.

Missing someone may become a kind of disease.

Missing is a illness.

MISSING IS ONE KIND OF SICKNESS

Missing is one kind of illness.