How to Observe Illness Through Laughter
Normal laughter expresses happiness. Medical researchers have found that many centenarians share a common trait: they love to laugh. China’s elderly longevity figures are often depicted with radiant smiles. However, laughter may also conceal signs of underlying illness. In medicine, such laughter associated with disease is called “pathological laughter.”
Older adults with diffuse cerebral arteriosclerosis may develop involuntary laughter due to ischemic degeneration of brain tissue causing functional disorders. This is often accompanied by tremors in the upper limbs, unsteady gait, and unclear speech.
Children with developmental delay may display peculiar, foolish laughter—“foolish laughter”—often accompanied by obvious intellectual disability. After excessive alcohol consumption, due to alcohol disrupting brain excitatory-inhibitory balance, uncontrollable laughter occurs, indicating acute alcohol poisoning.
Patients with tetanus exhibit tonic spasms of the masticatory muscles, causing the corners of the mouth to pull downward, upper lip tightly pressed against teeth—a “wry smile.” Patients with schizophrenia, due to abnormal brain function and symptoms like hallucinations, often talk to themselves and laugh foolishly. Uncontrollable laughter is termed “compulsive laughter.” Experts believe this may signal cellular degeneration or cerebral arteriosclerosis in the brain.
Therefore, in daily life, pay close attention. If you notice such pathological laughter, seek medical help promptly. Let doctors “follow the trail” from laughter to diagnose illness accurately and provide correct treatment.