How do choreiform movements affect the child?

Choreiform movements are involuntary, dancing, brief, rapid and sudden movements, which vary in intensity and severity. If mild, they can be masked into purposeful movements. They indicate a disorder of large collection of cells deep in the brain that are called basal ganglia. I would recommend that you consult a neurologist to confirm these movements and determine the cause (there are over 150 disorders that may cause this disorder).