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Ptosis is a condition that causes drooping eyelids. This could be caused by the weakening of muscles around the eye, aging, a complication of certain diseases, trauma, or it may be present from birth.
Causes of Down Syndrome. From what is known about the causes of Down syndrome, environmental factors and parents' behavioral activity do not seem to play a role. Most cases (approximately 92 percent) are caused by trisomy 21, which means each cell in the body has three copies of chromosome 21 instead of the usual two copies.