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.
According to the 2014 Ivory Coast census, Abidjan's population was 4.7 million, which is 20 percent of the overall population of the country, and this also makes it the 4th most populous city proper in Africa, after Lagos, Cairo and Kinshasa.