What is it called when you can’t stop smiling?

What is it called when you can’t stop smiling?

A toddler has been diagnosed with a rare genetic condition, which means he can't stop smiling. Little Elliot Eland suffers from Angelman syndrome, a chromosome disorder that causes severe learning difficulties.

Why do I smile at sad things?

Responding with laughter in deeply sad circumstances, for otherwise healthy people, is called an inappropriate affect — meaning, an emotional response to a stimulus that is either incongruous, or not quite as acute as it should be. … Nervous laughter is not genuine; rather, it happens out of fear, discomfort or stress.