Dysphagia is the medical word for difficulty in swallowing. This symptom is usually due to a problem of the gullet (oesophagus). Less commonly, a problem at the back of the mouth, or something pressing on the oesophagus, can cause this symptom. There is a range of different causes of dysphagia - discussed below.
Where in the World. The Mayans are one of the oldest societies documented, and come from Belize, Guatemala, Honduras and El Salvador in Central America and Mexico. You can still visit the ruins of the ancient people in these places today, like the Chichen Itza temple in the Yucatan Peninsula of Mexico.
The Maya, Inca, and Aztecs built great civilizations in Mexico and in Central and South America between 1,800 and 500 years ago. The first of these was the Maya civilization. About 2,800 years ago, people known as the Maya lived in farming villages on the Yucatan Peninsula and the highlands to the south. From about A.D. 250 to A.D. 900, they built city-states in Central America that included great pyramid temples and public plazas featuring huge stone columns that recounted their history.