“In Caucasians, the disease often appears suddenly, which usually indicates a more mild form of the disease that is of short duration. African-Americans and Puerto Ricans, on the other hand, tend to develop the more long-term and severe form of the disease.

In the United States, the lungs are often the most common site of initial symptoms for those who experience a gradual onset of their long-term disease. Lung symptoms are common in African-Americans, Puerto Ricans, and Scandinavians. Persistent dry cough, fatigue, and shortness of breath are the most common initial lung-related complaints.”.

Cleveland Clinic