Why do we tremble when we are nervous?

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Our hands and feet get shaky when nervous , why is that?

In: Biology
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Your body prepares to deal with the stressor, interpreting the anxiousness as a signal that you’ll need to stand your ground or escape from danger. Your muscles become primed to act, leading to a trembling sensation, twitching, or shaking. Tremors caused by anxiety are called psychogenic tremors.

https://www.healthline.com/health/anxiety-shaking

You’re not used to the adrenaline. Adrenaline is a drug, but just a hormone that does a series of things in your body, most noticeably, opening capillaries and flooding your body with blood to allow muscles to act more rapidly. If I recall correctly, it also enhances the effects of endorphins, making pain a lot less noticeable/ incapacitating. Just like any drug, though, you can develop a tolerance to it and learn how to function on it. Just like the 60 years old alcoholic never shows signs of being drunk, a person constantly in stressful situations doesn’t shake or jitter as adrenaline floods them. Adrenaline also allows the heart to go into overdrive and is used medically in a few conditions in the hospital, but I suspect doctors are very picky and choosey on when to use it and probably want heavy sedatives nearby if they do use it.

This is not the same as a fighter in a ring who is comfortable through exposure, but more like the people who have lived in battlezones their entire life. I wouldn’t be surprised if the constant exposure to adrenaline also caused permanent damage to their brains like other drugs do a well, but am unsure if any research has been done into the topic.

One word: Adrenaline. It rushes through your body when you get scared or are in danger. It messes with your nervous system as it goes through your body which causes the shaking. Adrenaline also does a bunch of other things to our body. Such as increased heart rate and sweat.

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Adrenaline makes us stronger. We get a stronger response from our muscles when adrenaline is dumped in our system.

This also applies to smaller movements. Your brain sends a signal that normally moves your arm 2cm to the left. The over-responding muscles move it 3cm. Your body’s feedback mechanisms say “whoa, too far, let’s bring it back a bit!” Your over-responding muscles bring it back too far… You experience this over-response as shakiness.