
The symptoms sound innocuous?uncontrolled laughing and crying?but its effects can be seriously disabling in social and occupational settings. Pseudobulbar affect (PBA), also known as emotional lability, is believed to affect up to one million patients with neurological disorders, including amyotrophic lateral sclerosis (ALS), multiple sclerosis, Alzheimer's disease, and stroke. Currently there are no approved treatments for this condition.