Why does my left lower eyelid keep jumping?

When facial nerve is compressed or stimulated by blood vessels, it is easy to cause eyelid to keep beating.

People often say that "the left eye jumps over wealth and the right eye jumps over disaster". In fact, medically speaking, eyelids have nothing to do with people's wealth and fortune. It's just a disease. In a sense, eyelids can also be regarded as an alarm to human health, especially related to the cranial nerves.

When the facial nerve that controls the eye muscles is stimulated or oppressed by the outside world, it will contract, thus causing the eyelid (medically called eyelid) to jump.

There are two kinds of muscles in people's eyelids, one is called orbicularis oculi muscle, which is shaped like a wheel and surrounds the eyes. When it contracts, the eyelids close. This orbicularis oculi muscle is dominated by the facial nerve. Another eyelid muscle is called levator palpebrae superioris. When it contracts, the eyelids will open. This muscle is dominated by the oculomotor nerve.

In these two kinds of muscle tissues of eyelid, orbicularis oculi muscle plays an important role in protecting eyeball. It can lubricate and clean the cornea through continuous closure and make a protective response to any external stimulus.

Under normal circumstances, these activities of opening eyes and closing eyes are dominated by brain nerves. Once stimulated by some external factors, the facial nerve that dominates the orbicularis oculi muscle may act autonomously without listening to the command of the brain, causing the orbicularis oculi muscle to contract repeatedly, even twitch or vibrate, and people will obviously feel that the eyelids are beating involuntarily, which is eyelid jump.

Most people are limited to the beating of the upper eyelid or the lower eyelid, but some people will gradually develop into the continuous twitching of the upper and lower eyelids.

Stimulating facial nerve innervating eyelid muscles in any part of conduction pathway can cause eyelid pulsation. The location, range and degree of eyelid beating are different with different stimulated nerve sites.

If the stimulation factor is limited to the nerve endings that dominate the orbicularis oculi muscle, that is, near the eyelid, then the symptom is simple upper eyelid or lower eyelid jump. If the stimulation site is the facial nerve trunk in the brain cavity, then the beating range will involve the whole upper and lower eyelids. The most intuitive performance is involuntary blinking, which is called "eyelid spasm" in medicine.

Eyelid pulsation is caused by many factors and can also be regarded as an alarm of human health.

One is physiological stimulus response. Such as nervousness, fatigue, overuse of eyes, working in strong light or dark light for a long time, using computer for too long, etc. , make the eyelids beat involuntarily.

However, this kind of eyelid pulsation is very small, usually only I know, as long as I get rid of these stimulating environments and rest properly, I can recover.

The second is some psychological reactions. For example, some candidates with excessive psychological pressure, children or young adults with this habit, and some patients with nervous system diseases may have symptoms of eyelid jumping.

The third is the reflection of some eye diseases on the eyelid surface. Such as keratitis, conjunctivitis, ametropia, myopia or hyperopia without wearing appropriate glasses. , may lead to eyelid jump.

Fourth, facial nerves are stimulated or compressed. One of the main reasons is that some blood vessels in the brain are abnormal. When blood passes through blood vessels, the blood vessels compress facial nerve roots, which leads to autonomic convulsions of eyes and facial muscles.

In addition, some brain tumors or arteriosclerosis may stimulate facial nerves and cause strong reactions in the eyes and face.