His cough is more like wheezing.

他的咳嗽有呼哧呼哧的响声。 

His cough is dry, producing no phlegm. 

他是干咳，没有痰。 

He has coughed up blood. 

他咳嗽有血。 

His breathing has become increasingly difficult.

他呼吸越来越困难。 

He has to breathe through his mouth.

他要用口呼吸。 

He is short of breath, even when he has not been exercising, he is breathless. 

他喘气；即使不运动，他也是上气不接下气。 

His nose stuffed up when he had a cold.

他感冒时鼻子就不通。 

He coughs up a lot of phlegm thick spit on most days. 

他多半时间咳出浓浓的痰。 

He has a feeling of tightness in the chest or a feeling that he is suffocating.

他胸部觉得闷闷的，好象透不过气来。