Onsen and Sento Etiquette: A Survival Guide to the Japanese Bathhouse

Zao Onsen Open-Air Bath is known as the "hot spring for creating beautiful women" due to it's highly acidic sulfur spring water.

Overview

For many travellers, visiting an onsen or sento is one of the most memorable experiences in Japan and also one of the most intimidating. 

Bathing culture in Japan goes back centuries. Natural hot springs, known as onsen, have been used for their mineral properties since at least the 8th century. Sento, or public bathhouses, became common during the Edo period when most homes did not have private baths. Over time, communal bathing became more than hygiene. It became a way to relax, reflect and connect quietly with others. 

A traditional onsen sign, often spotted in rural towns of Japan. Photo by Jeong yunji.

Even today, despite modern bathrooms in nearly every home, onsen and sento remain part of everyday life. People visit to unwind after work, soothe sore muscles and enjoy a nice relaxing bath. 

If you understand a few simple rules, the experience becomes far less daunting and far more enjoyable. 

Onsen vs Sento: What’s the Difference? 

Before you go, it helps to understand the distinction.

Onsen use natural hot spring water that contains minerals and are often found in rural areas or attached to traditional inns called Ryokans.

The inside of an onsen (hot spring bath)

Sento use heated tap water and are usually located in residential neighbourhoods. The etiquette for both is essentially the same. 

The inside of a sento (Japanese bathhouse). Photo by Soyoung HAN

Step by Step: How to Use a Japanese Bathhouse 

1. Pay and Enter 

At sento, you usually pay at the entrance, sometimes using a ticket machine. Onsen attached to hotels may include the bath in your stay.

You will typically receive a locker key and sometimes a small towel, and both small and large towels are usually available to rent, so you do not need to carry your own. 

2. Undress Completely 

Bathing areas are separated by gender. You must remove all clothing before entering the bathing area as swimsuits are not allowed. Place your belongings in a locker and bring only your small towel with you. 

A typical sento locker room: leave your phone and belongings here.

3. Wash Thoroughly Before Entering the Bath 

This is the most important rule. Before entering the bath, grab one of the small stools and plastic buckets and sit at a shower station. Most bathhouses provide soap, shampoo and conditioner, so you usually do not need to bring your own.

Wash your body and hair thoroughly, using the small towel to rinse yourself properly.  

Showering is done seated, not standing, so sit down, take your time and make sure all soap is completely rinsed off before moving to the bath. The baths are for soaking, not washing. 

4. Enter the Bath Slowly 

The water is hot, often between 40 to 42 degrees Celsius, so enter gradually and allow your body to adjust. If there are multiple baths available, you can move between them at your own pace.

I personally love moving from a hot bath straight into a cold plunge, which is usually around 10 to 12 degrees. It is a shock at first, but incredibly refreshing once you get used to it. 

How to Use the Small Towel 

The small towel is used to wash and rinse your body and to carry between baths. While soaking, place it on your head or neatly on the side of the bath. It should never touch the bath water and should not be wrung out into the bath. Many locals fold it and rest it on their head while relaxing. 

Place the small towel on your head when relaxing in the bath.

Basic Bathhouse Etiquette 

Do 

• Wash thoroughly before entering the bath 

• Tie long hair up 

• Keep noise low and move calmly 

• Dry yourself lightly before returning to the locker area 

  
  

Do Not 

• Bring your phone inside 

• Take photos 

• Swim or splash 

• Enter the bath with soap on your body 

  
  

Tattoos: What You Should Know 

For many travellers, tattoos are the biggest question when it comes to visiting an onsen. Some facilities still restrict visible tattoos due to historical associations, though policies vary.

You can look for tattoo friendly onsen, cover small tattoos with patches or book a private bath. Sentos in Tokyo are often more relaxed, but it is always worth checking in advance. 

Tattoos have historically been linked to the Yakuza, which is why some bathhouses still restrict them.

After the Bath 

When you are finished, lightly dry off before returning to the locker room. Take your time getting dressed and freshening up. Hairdryers are usually available, sometimes for a small fee, along with cotton buds and other basic amenities.

Many bathhouses sell milk or sports drinks, and it is common to sit for a few minutes and cool down before leaving. 

Try the traditional "coffee milk" after your bath to rehydrate the body.

Final Thoughts 

Onsen and sento are more than just another tourist experience. They reflect something deeper in Japanese culture, a shared understanding of quiet respect, cleanliness and routine.

There is something grounding about sitting in hot water with strangers in silence. No phones. No distractions. Just steam, stillness and time to slow down. Once you have experienced it properly, it tends to stay with you.

If you are visiting Japan, stepping into an onsen or sento is worth pushing past the initial hesitation. Understand the rules. Wash properly. Relax into it. You might find it becomes one of the most peaceful and memorable parts of your trip.

Have you tried a Japanese bathhouse before, or is it still on your list?

Let us know in the comments below.