A 69-year-old man's urge to be funny grew so relentless that he would wake his wife in the middle of the night, bursting into laughter, just to share jokes he had come up with. At her request, he started writing them down instead. By the time he arrived for a neuropsychiatric evaluation, he brought roughly 50 pages of material, most of it puns or silly jokes with sexual or bathroom themes.
Neurologists Elias D. Granadillo and Mario F. Mendez described the man in a 2016 report in The Journal of Neuropsychiatry and Clinical Neurosciences, diagnosing Witzelsucht, a rare syndrome whose German name combines the words for joke and addiction. The strangest part lay beneath the nonstop comedy. He could still pick out the punchline of someone else's joke. He just didn't find it funny.
A Brain Bleed, a Small Stroke and a Sudden Turn Toward Comedy
The man's brain troubles began 10 years before his evaluation, when he had a subarachnoid hemorrhage, a type of bleeding around the brain, of undetermined cause. It led to fluid buildup that required a shunt and left a small area of damaged tissue in the right frontal region.
His personality changed afterward. He became fixated on recycling, going through dumpsters for recyclable items, and began hoarding napkins and utensils from restaurants and other places.
Five years after the bleed, a second, fairly abrupt shift arrived. He started joking constantly and became disinhibited, hugging younger women for too long, making borderline offensive comments and taking candy from stores without paying. He was caught several times. An MRI then revealed a new small stroke in the head of the left caudate nucleus, a deep structure connected to frontal lobe circuits.
He scored 29 out of 30 on a standard cognitive screening test and had full insight into his excessive joking. More detailed testing, however, showed problems with frontal-executive skills such as response inhibition and self-monitoring.
Recognizing a Punchline Without Feeling It
Humor testing showed elevated humor creativity. On the Joke and Story Completion Test, a multiple-choice measure of humor appreciation, he correctly identified the punchlines of 16 jokes. Yet he did not laugh at them or report that they felt funny, and additional jokes produced the same result.
The paper also described a second patient, a 57-year-old man with behavioral variant frontotemporal dementia who had gradually become a relentless jokester over three years. He lost his job after an insulting outburst about his workplace, and his wife found dozens of coffee grinders and almost two dozen Hawaiian shirts piled up in their garage. He, too, could recognize most punchlines without being amused. He died 11 to 12 years into his illness, and an autopsy confirmed Pick's disease, with frontal and temporal lobe shrinkage that was worse on the right side.
Summing up both men, the authors wrote, "In essence, their humor was entirely internally driven."
They stressed that this differs from pseudobulbar affect, in which bouts of laughing or crying are set off by trivial triggers and often don't match a person's mood. The first man laughed at his own material, but his laughter was neither uncontrollable nor involuntary.
Why the Right Frontal Lobe Draws Attention
Granadillo and Mendez proposed that pathological joking arises from a combination of injuries. Damage to the right frontal lobe appears to impair the ability to integrate and enjoy humor that comes from other people, they wrote, while damage to the orbitofrontal cortex removes social brakes. Self-generated jokes then become the main trigger of the brain's reward areas. The compulsive quality, they suggested, points to additional disruption in frontal-striatal circuits involved in inhibitory control.
That is a proposed model based on two patients and earlier research, not a proven mechanism. Both men had damage affecting both frontal lobes, and the authors suggested that involvement of both sides may be necessary.
A historical review in Der Nervenarzt by researchers at Leipzig University traced the term Witzelsucht to German neurologist Hermann Oppenheim in 1890 and noted that he singled out the right frontal brain as important for humorous behavior. Modern research supports the idea that right frontal damage can produce the disorder, the reviewers wrote, though whether the left hemisphere must also be injured still needs study.
Clinicians have tied the syndrome to other lesions as well, including a 56-year-old man who developed Witzelsucht and hypersexuality after bleeding in the right putamen, a structure deep in the brain. Mendez had also published an earlier report on Witzelsucht in frontotemporal dementia.
No Proven Treatment for Compulsive Joking
There are no evidence-based drug treatments for pathological humor, the authors noted. SSRI antidepressants, which the National Institute on Aging says are commonly prescribed for disinhibition in frontotemporal disorders, did not reduce the joking in either man. The first man also did not respond to trazodone.
A combination of dextromethorphan and quinidine, used for pathological laughter, produced a partial response. His laughing episodes became less frequent and shorter, but his compulsion to make and tell jokes did not change. He remained stable on that regimen.
The authors suggested clinicians could borrow from treatments for disinhibition in other conditions, such as the antiseizure drugs valproate, carbamazepine and lamotrigine, and, if those fail, low-dose atypical antipsychotics. Those suggestions are not backed by trials in people with Witzelsucht.
The report involves only two men, and Witzelsucht is considered rare. Its message for families still holds. The most common frontotemporal disorder changes personality, behavior and judgment, and people with it often don't recognize that their behavior is unusual, according to the National Institute on Aging. A sudden personality change in adulthood, including new disinhibition, inappropriate joking or compulsive habits, can reflect a neurological problem such as stroke or frontotemporal dementia and is worth raising with a clinician.
Key Questions Answered
What is Witzelsucht?
A rare neurological syndrome marked by compulsive, often inappropriate joking. It is most often linked to frontal lobe damage, particularly on the right side.
What caused the man's compulsive joking?
His doctors linked it to an earlier brain bleed that damaged his right frontal region, followed years later by a small stroke in the left caudate nucleus.
Did he find other people's jokes funny?
No. He identified punchlines correctly but did not laugh or say they felt funny. The second patient showed the same pattern.
Is Witzelsucht the same as uncontrollable laughter?
No. In pseudobulbar affect, trivial triggers set off laughing or crying. The man's laughter was neither uncontrollable nor involuntary.
Can it be treated?
There is no proven treatment. One drug combination made his laughing episodes shorter and less frequent but did not curb his urge to tell jokes.
When should families be concerned?
New disinhibition, inappropriate behavior or compulsive habits in an adult warrant a clinician's evaluation, because they can signal a neurological condition.
