Shortness of breath is by far the most common of emphysema symptoms. Most people with emphysema first notice something's wrong when they become winded during a previously routine activity. This might be climbing stairs or mowing the lawn. The shortness of breath in emphysema results from structural changes in the lungs.
The African city with the largest population is Lagos, Nigeria. In 2014, the city was estimated to have a population of 21 million people.
The area of Mainland Africa is shared by 48 countries, plus six island nations (see list below). Population: 1.1 billion human inhabitants, about 14 percent of the world's population (in 2016). By far the most populated country is Nigeria with 185 million people. (Source: UN 2015 Revision of World Population Prospects)