Inappropriate laughter

What it means

Laughing that may be excessive and/or inappropriate in context (e.g., laughing at a funeral while others are crying).

Rare diseases that can present with this9

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category