Why does Dory lose memory?

Why does Dory lose memory? This means that Dory’s short term memory loss is hereditary, at least, according to Dory herself. Meaning, she wasn’t in an accident that caused her to lose her memory but inherited it from her family of other Blue Tangs. This makes it even more important for Dory to find her family in Finding Dory.

This means that Dory’s short term memory loss is hereditary, at least, according to Dory herself. Meaning, she wasn’t in an accident that caused her to lose her memory but inherited it from her family of other Blue Tangs. This makes it even more important for Dory to find her family in Finding Dory.