An eight-year study of 670 men aged 45 to 86 showed that anger and hostility can speed up the rate at which lung power declines with age.
Men with higher levels of long-standing anger at the study's beginning had significantly poorer lung function by the end.
The researchers rated anger levels with a scoring system. Lung power was tested three times over the course of the study.
Even after taking into account other factors, such as smoking, the hostility and anger affected lung function.
Anger, hostility and stress have previously been associated with heart disease, asthma and other illnesses. The emotions may change biological processes, disturbing the immune system and causing chronic inflammation.