Fake laugh
Introduction
Introduction After the illness, most of the human expression is painful. Few people can associate laughter with the disease. However, a closer look reveals that the smile on some faces reveals helplessness and distress. Behind these "laughs", it is likely to hide certain diseases. The smirk is only a smile, but the facial expression is not happy and passionate. The heart is melancholy, but often with a smile, but careful observation will reveal that the patient is only laughing at the corner of his mouth, but there is no happy light in his eyes, like a fake smile, some people call it Do not laugh".
Cause
Cause
This kind of laughter is seen in patients with occult depression. The inner melancholy is often smiling at people. Only the mouth is laughing, but the facial expression is not happy and passionate. In other words, covering other parts of a person's face, only the eyebrows and eyes are exposed. If it is a real laugh, it can still be seen that he is smiling. If he is a smirk, he can only see a pair of godless eyes.
Examine
an examination
Related inspection
Facial nerve examination of facial nerve movement examination
The heart is melancholy, but often with a smile, but careful observation will reveal that the patient is only laughing at the corner of his mouth, but there is no happy light in his eyes, like a fake smile, some people call it Do not laugh".
Diagnosis
Differential diagnosis
It is common in tetanus patients. This kind of laughter is not caused by the patient's heart, but is a destructive pathological manifestation. The result is that the sputum toxin secreted by tetanus bacillus first invades the facial muscles and causes tension contraction. . Laughter is accompanied by symptoms such as tightness of the jaws, rigidity of the limbs and reversal of the horns.
Strong laugh: more common in elderly patients with diffuse cerebral arteriosclerosis and brain degeneration and other organic lesions, the patient smiled reluctantly, but involuntarily, can not restrain, this is due to damage to the brain tissue, caused by neurological dysfunction.
Weird smile: more common in patients with facial nerve spasm, due to a side of the patient's nerve paralysis, suffering from lateral muscle spasm, nasolabial folds shallow, laughing when the mouth angle to the healthy side, the mouth is skewed, making the smile strange and awkward.
Smirking: more common in patients with cerebral arteriosclerosis, senile dementia, etc., due to the influence of intelligent obstacles, although the patient is often happy, but the facial expressions give people a stupid feeling.
