I tried to join the army but was rejected because of poor health.

我想参军，但因身体不好而碰了一鼻子灰。

《新英汉大辞典》

He was forced to retire early because of poor health.

他身体不好，只好早早退休。

youdao

He tried to join the army but was turned down because of poor health.

他想参军，但因身体不好被断然拒绝。

youdao

The artist who created Charlie Brown and his dog Snoopy had retired a month earlier because of poor health.

VOA: special.2009.10.25

Right now, too many women are held back from reaching their full potential because of poor health reinforcing a cycle of stagnant social and economic growth.

FORBES: Philanthropy that Delivers for Women

Raedemaeker was initially held in Gansu but was later allowed to live with his partner in a Beijing hotel because of his poor health, media reports say.

BBC: Belgian art dealer convicted of smuggling in China dies

Tests are carried out in London in early January 2000 and a week later, having considered the results, Mr Straw says he is "minded" to release the general because of his poor health.

BBC: The Pinochet case: 18 months in three minutes