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.
Here is the list of world's most populated cities as reported by the UN. 1  1. Tokyo, Japan : Tokyo tops the list and remains the world's largest city with 38 million dwellers. 2  2. Delhi, India: With 25 million, the Indian capital is the second-most populated city in the world.