Pseudobulbar affect, also known as PBA, is a condition that causes outbursts of sudden, uncontrolled laughter or crying that don’t match how a person feels or that is out of place in a given situation. Outbursts of laughter or crying can range in duration and severity and can occur up to several times a day. Other symptoms of PBA include inability to control laughing or crying, excessive laughing or crying when something is only mildly funny or sad and intrusion of thoughts that cause excessive laughing or crying.
PBA develops when damage is present in the area of the brain responsible for controlling what is considered to be normal expression of emotion. The damage can affect brain signaling system which causes involuntary crying or laughing. Damage occurs when there is a neurological condition or brain injury, making the condition common among people with ALS. For those with ALS and PBA, bouts of crying are more common than laughter. People with ALS can also have frontotemporal dementia (FTD), which is another condition common with diseases like ALS that cause neurological damage.