In early 2017, Qatar's total population was 2.6 million: 313,000 Qatari citizens and 2.3 million expatriates. Qatar is a high-income economy, backed by the world's third-largest natural-gas reserves and oil reserves. The country has the highest per capita income in the world.
1 Leg pain refers to any kind of pain that occurs between the heels and the pelvis. 2  Many causes of leg pain are obvious, such as injury after an accident.  Leg pain can have less obvious causes, such as peripheral artery disease.
1 Aching or burning sensation in the muscles (not the joints) of your legs or arms, such as when walking up a hill or doing repetitive arm exercises, such as hanging up laundry. The sensation stops after you've taken a short break. 2  Legs feel tired or heavy.  Discoloration of, or numbness in, the legs or feet.