What could a high, arched palate be a sign of other than marfan's syndrome?

Sometimes normal: Normal people sometimes have a high-arched palate. One should not worry about Marfan syndrome unless one has several of the physical appearance features (then a doctor's evaluation should be obtained). Having just one of the physical appearance features in an otherwise normal individual does not necessarily suggest Marfan syndrome or any other problem.

Environmental: Due to environmental factors affecting breathing in growth and development, these may contribute to palate shape in people who mouthbreathe. Just because there is a high palate, it alone is not a sign or a predictor of an underlying condition. If you are healthy, breathe well, and show no other predilection to marfan's or any other syndrome, then i would not be too concerned.

Lots of things: We see high narrow palatal vaults in children with digit habits, sinus problems, enlarged t;a, and in those who inherit this shape from their parents. Seen in many syndromens. In children it's easy to fix. In adults the fix is a bit more complex. Ask your dentist to refer you to an orthodontic specialist who can evaluate how the skeletal and dental parts of your face come together and function.