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This Mysterious Disease Makes People Laugh Even When Nothing Is Funny

A good cry can do wonders for the body and mind. Same with a good laugh. But what if you had no control over whether you laughed or cried? That’s what it’s like for people with PseudoBulbar Affect (or PBA), a condition that causes uncontrollable crying and/or laughing. It affects some two million Americans and potentially another seven million Americans who have PBA-like symptoms.

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