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Labile affect or Pseudobulbar affect refers to the pathological expression of laughter, crying, or smiling. It is also known as "Emotional Lability", "Pathological Laughter and Crying", "Emotional Incontinence", or more recently Involuntary Emotional Expression Disorder (IEED).  An individual may find themselves laughing uncontrollably at something that is only moderately funny, being unable to stop themselves for several minutes. Episodes may also be mood-incongruent; an individual might laugh uncontrollably when angry or frustrated, for example.
It is most commonly observed after brain injury or degeneration in Amyotrophic lateral sclerosis (also known as motor neuron disease). It affects up to 50% of patients or up to 17,000 people, particularly those with pseudobulbar palsy. 
While not as profoundly disabling as the physical symptoms of these diseases, labile affect can have a significant impact on individuals' social functioning and their relationships with others. In a disease such as Motor Neuron Disease, the majority of patients are cognitively normal; however, the appearance of uncontrollable emotions is commonly associated with learning disabilities. This may lead to severe embarrassment and avoidance of social interactions for the patient, which in turn has an impact on their coping mechanisms and their careers.
Treatment is usually pharmacological, using anti-depressants such as fluoxetine, citalopram, or amitriptyline in low to moderate doses. In the USA, a combination of dextromethorphan and a subtherapeutic dose of quinidine has been submitted to the FDA for approval to treat emotional lability.
- ↑ Cummings J, Arciniegas D, Brooks B, Herndon R, Lauterbach E, Pioro E, Robinson R, Scharre D, Schiffer R, Weintraub D (2006). Defining and diagnosing involuntary emotional expression disorder.. CNS Spectr 11 (6): 1-7. PMID 16816786.
- ↑ Brooks B, Thisted R, Appel S, Bradley W, Olney R, Berg J, Pope L, Smith R (2004). Treatment of pseudobulbar affect in ALS with dextromethorphan/quinidine: a randomized trial.. Neurology 63 (8): 1364-70. PMID 15505150.
- sr:Емоционална лабилност
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