The Scientific Explanations Behind 25 Quirky Body Reactions

Your eyelid randomly starts to twitch

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A twitchy eyelid, known as blepharospasm, often happens randomly and can last anywhere from minutes to days. Most are usually harmless and don't affect your vision. "We don't know why this happens exactly but fatigue, caffeine, and stress are common culprits," says Dr. Rantala. "I often recommend trying to stretch the muscle that is twitching." This condition will typically go away on its own but if it lasts for more than a couple days, seek a physician immediately. Here are the 17 body part names they never taught you in health class.

You taste metallic saliva right before you vomit

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The copper-like taste you get right before you throw up is your body's response to the stomach acids that are about to enter your mouth. "That's water brash," John F. Kuemmerle, MD, professor in the division of gastroenterology, hepatology, and nutrition at the Virginia Commonwealth University School of Medicine, told Slate. "When things are getting ready to come back up into the esophagus, there is a reflex that causes you to salivate heavily." Your body produces basic saliva to neutralize the acidity of the vomit. If this metallic saliva happens on a consistent basis, you could suffer from silent reflux, a condition where the stomach's acidic contents come up into the esophagus.

Your nose burns when water goes up it

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Cold freshwater is your nose's worst enemy because the inside of your nose is a salty environment. "The cells in our body have a salinity content," Stacey Gray, MD, director of the Sinus Center at Massachusetts Eye and Ear told Stat News. "Freshwater doesn't have any salt in it so it's very shocking to the inside of our nose when water goes inside." The nerve endings that line the inside of your nose feel a burning sensation as the nose's mucous rids itself of the freshwater invasion to restore its natural, salty environment.

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