治疗 + 病 / 生 + 病
The noun 病 (bìng) means illness, disease, or sickness. It is one of the most common words for referring to medical conditions in Chinese. It can be used broadly for any kind of ailment, from minor colds to serious diseases.
他得了一场大病,在家休息了两个月。
tā dé le yì chǎng dà bìng, zài jiā xiū xī le liǎng gè yuè.
He got seriously ill and rested at home for two months.
这种病不太严重,吃几天药就好了。
zhè zhǒng bìng bú tài yán zhòng, chī jǐ tiān yào jiù hǎo le.
This illness isn't too serious; a few days of medicine will fix it.
医生说她的病已经完全好了,不用担心。
yī shēng shuō tā de bìng yǐ jīng wán quán hǎo le, bú yòng dān xīn.
The doctor said her illness has completely recovered, so there's no need to worry.