Weird Superstitions that Japanese/Korean People Believe

I’ve lived in Asia for over 5 years now, and I’ve heard a lot of strange things from Japanese and Korean people. I thought I’d compile them here for your reading pleasure. Some of them are superstitions that many people believe, and others are things that certain people have said to me that the general population may or may not agree with.

Adapting to a new culture means trying not to let your own prejudices get in the way of your view of the culture. However, I’ve heard a lot of funny things come out of people’s mouths, most of them not based on any sort of reason or fact. Some of them are based on ancient Eastern medicine, but others are just hearsay.


  • Wearing a mask in public minimizes your risk of catching a cold.

Many Japanese people wear masks on a daily basis. You’ll see tons of people walking around in Japan with white masks on, most of them paper thin. Japanese people mostly believe that wearing a mask will keep them from spreading their germs to others when sick. Others believe wearing a mask will prevent them from catching a cold, since Japan is crowded and most people use public transportation. However, these masks are thin and people wear them all day long. Some of my students used to take them off for lunch time, only to put the same mask they’d been breathing on all day back on their faces.

Other reasons for wearing masks include women who wear them to cover up their faces if they aren’t wearing make-up. I’ve also had friends tell me they wear them when it’s cold outside because it keeps their face warm. In both Korea and Japan, people also wear them to minimize the amount of pollution or pollen they inhale when the air quality is bad, or during allergy season.

  • Japanese people have black eyes, therefore they don’t need sunglasses

This one is a weird one that one lady told me in Japan. I was leaving the school I taught at, and I put my sunglasses on before going out the door. I rode my bike to school, and the sun was always in my eyes when I rode over the hills back home. She was so sincere when she said it that I wondered who told her that or what in the world would make her believe that the color of a person’s eyes determines one’s protection against sunlight. I wanted to tell her, “Uh, lady, if we both look at the sun right now, both of us will eventually go blind.” But I bit my tongue and laughed it off as I went home.

  • Going outside when your hair is wet will make you catch a cold

You’ll see this in Japanese dramas all the time. The main character goes outside, it starts to rain, and then they immediately get sick and have to be taken care of by (usually) their love interest. I’ve heard that Italians also believe this one. I think this is also related to the fact that Japan is so densely populated – if your immune system is weakened around a lot of other people, eventually someone who is sick will pass their virus to you. However, going outside in the rain or with wet hair isn’t going to make you sick, especially not after 10 or so minutes.

  • Not covering your abdomen will make you sick (women)

Once I was outside for a walk with my Japanese friend, and I told her I was on my period. She told me, “You need to cover your abdomen!” and she made me zip up my jacket. I’ve also heard people say that if you expose your abdomen when you go outside (i.e. wearing a crop top) will make you sick. I think this comes from Chinese medicinal beliefs.

South Korea

  • Drinking cold water is bad for you

The younger generation might not believe this anymore, as is the case with most of these Korean superstitions, but Koreans think drinking cold water will make you sick. They think the water needs to be lukewarm/warm in order to be properly digested. I guess because they think your body maintains a warm temperature, they think making your insides colder will make you catch a cold.

  • Drinking clear water is bad for you

This is mostly what older Korean people believe. If you go to my mother-in-law’s house, she’ll tell you not to drink clear, bottled water. Instead, she’ll grab the brownish tea-like liquid from the fridge and make you drink that. If you go to a lot of Korean restaurants, many have water machines, but others will have a weak tea-like drink for you in a bottle. I think it’s a sort of barley tea. In Japan, you’ll mostly find cold barley tea in summer and warm green tea in winter in restaurants as well.

  • Canned food is bad for you

My husband says this. He’s very against me eating anything out of a can. However, the sweet yellow corn that I love can only be bought in Korea in canned form. Also, yellow peaches and fruit cocktail are also only available here in cans. He won’t give me a reason for why it’s unhealthy. He just thinks it is. Growing up, my house was always full of canned food…

  • Fan death

If you don’t know what fan death is, you’ve probably never been to Korea. Fan death is the very popular superstition that if you leave an electric fan on in a closed room (no open windows or doors), you will die.  My mother-in-law in particular believes this. She used to yell at my husband whenever he was in his bedroom with the door closed with a fan on. They need to be more worried about their kerosene heaters – those actually cause hundreds of deaths each year.

  • Cilantro causes paralysis

This is another one of those weird ones that one of my Korean friends told me. She said she heard from another one of her friends that if Koreans eat too much cilantro (an herb that most Koreans are allergic to or can’t stand the taste of) they will be paralyzed. I find it weird that Koreans hate cilantro so much, since they eat a leaf similar in taste called perilla (깻입). Many Koreans are now traveling to Vietnam for vacation, and they come back complaining that the cilantro in their pho was gross. Pho is gaining popularity here in Korea, but it’s usually optional if you want to put cilantro in your soup.

  • Germs are bad

Americans are germaphobes, too, but Korean moms are no joke. They bring bottles of antibacterial spray around with them and spray everything in sight before letting their kids touch anything. Guess they’ve never heard the old adage, “God made dirt, dirt don’t hurt!” because that’s how I was raised. A lot of Koreans have skin allergies and other health issues, probably due to pollution and genetics more than anything, but they think anything their babies touch will cause death if not sanitized.

  • Not washing hands after using restroom

This is a weird one after the one above it, but there it is. I’ve seen maybe 2 out of 10 people in Korea wash their hands after leaving the bathroom. The water in Korean bathrooms is usually freezing cold, and there are usually a) no soap dispensers or b) a weird soap on a stick thing that you can use to wash your hands. Also, many public restrooms don’t have toilet paper, but it’s gotten a little better since I moved here. However, many places have notes on the doors telling you to throw away your toilet paper rather than flush it because it clogs the toilets. In most places, this isn’t true, but in older buildings, the pipes aren’t as great and the toilets do clog easily. However, even in newer buildings, people throw away their used toilet paper and it collects next to you in a gross pile.

  • Having a baby around animals will give them allergies

This is one my sisters-in-law and mother-in-law believe. No matter how many times my husband or I tries to show them research saying that raising kids around animals actually makes them less likely to develop cat/dog allergies, they simply won’t have it. They are mad at us because we have two cats and think that before we have kids, we need to get rid of my furbabies. Not only is this ignorant, it’s downright rude to tell us that we need to “get rid of” our pets. This is the one that bothers me the most.

What are some weird superstitions you’ve heard, in your country or abroad?

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4 thoughts to “Weird Superstitions that Japanese/Korean People Believe”

  1. The cold water one also reminds me of the Chinese obsession with drink temperature. Firstly, almost everyone prefers their drinks at room temperature, and in vending machines you often have a choice, but in very local Chinese restaurants they usually serve beer at room temperature (ugh!). Like you, I’ve been told this is because of cold drinks’ effects on the stomach. Another thing is that they believe cold drinks are particularly harmful when you’re on your period. I was very shocked one day when a male friend ordered me a beer then said “oh, cold beer is OK, right? You’re not on your period, are you?”

    Reading the Korean beliefs you listed reminded me of something my Korean roommate told me (I don’t know if it is a family belief or more common). Our kettle was starting to get a limescale build-up, and she started freaking out, saying that consuming the deposits from the hard water can cause locked-in syndrome, or as she explained it, your body being turned to stone… Creepy!

    Anyway, very nice post!

    1. Haha, turned to stone!? That’s pretty weird.

      Oh yeah, one I forgot was – my mother-in-law thinks the burnt parts of food will give you cancer. I think research has been done to prove that burnt food is slightly carcinogenic, but she takes it to the extreme by never letting us eat anything slightly burnt.

      Thanks for the comment!

  2. -Drinking clear water is bad for you-
    When I’m really thirsty, all I want is water. That being said, I really loved the barely tea I drank in Korea. They can keep that superstition, haha.

    -Not washing hands after using restroom-
    This is so gross and is in Japan and I hate it. And as you know, the kids at school do the same. Get their hands a little wet in the ice cold sink and call it ‘clean’. Next week, half of the 1st years are out with the flu. Coincidence?

    -Japanese people have black eyes, therefore they don’t need sunglasses-
    I don’t know about absolutely not needing sunglasses if your eyes are black, but! Having non-black eyes does mean you have less pigment and thus less protection from the sunlight. Sometimes I do feel like people think I’m trying to look “cool” when I wear mine biking to work. Nah, just trying not to die when the bus wind shield glares a blinding light at me!

    Nice post! 😀

    1. Yeah, my Japanese students also only cleaned their school with rags and cold water – no bleach or anything. It was gross. I got sick a lot when I was a public school teacher!

      But Asians don’t have BLACK eyes haha they have dark brown eyes… the word she used was “Kuroi” which can mean black or really dark. I have brown eyes, too, so I have just as much pigment in my eyes as Asian people haha.

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