Zhao Wenhai spends most of his time sitting in bed, even during the middle of the night, because he is afraid lying down will kill him.
Zhao, 43, was diagnosed with third-stage black lung disease, the highest severity of the illness, in 2007 after he spent six years toiling at a small gold mine in Northwest China's Gansu province between 1998 and 2003.
Zhao became a taxi driver in his native Gulang county in Gansu after he left the mine in 2003. He developed a bad cough the same year.
He lost the ability to work in 2010.