Before You Bathe: Preparation & Safety Checklist | Ministry of Environment Guidelines

Essential Steps Before Bathing

1. 1

   Hydrate (one glass of water)

   Drink a glass of water (approx. 200 ml) before entering. Avoid alcohol or caffeinated beverages beforehand.

2. 2

   Rinse with a ladle (kakeyuu) — feet first

   Pour hot spring water over your feet, then knees, hips, and shoulders to gradually acclimate your body and prevent sudden blood pressure changes.

3. 3

   Check your physical condition

   If you have a fever, feel unwell, or have consumed alcohol, skip the bath and rest instead.

4. 4

   Secure your valuables

   Store wallets, phones, and jewellery in a locker before entering the bathing area.

When to Skip Bathing Altogether

• Fever or acute illnessSoaking in hot water can place extra strain on a body already weakened by illness. This can exacerbate symptoms and potentially delay your recovery process, so it's best to rest and wait until you have fully recovered.
• Immediately after eating (wait at least 30 minutes)Bathing diverts blood flow to the skin's surface, away from your digestive organs. Soaking immediately after a meal can interfere with proper digestion and may lead to indigestion or lightheadedness, so allow your body time to rest.
• Right after intense exerciseYour body is already under stress from an elevated heart rate and temperature after strenuous activity. Soaking in hot water immediately can further strain your cardiovascular system, so it is important to cool down and rest first.
• Early or late pregnancyHigh water temperatures and the physical effects of bathing can place undue stress on the body during these sensitive periods. It is generally advised to avoid hot springs during the first and third trimesters to minimize any potential risks.
• Known contraindications for the spring typeCertain medical conditions can be worsened by the specific mineral content or temperature of a hot spring. Always check the listed contraindications for the onsen you plan to visit and consult a physician if you have any health concerns.