Who should avoid hot springs, and what bathing habits are risky? Based on Japan's Ministry of the Environment contraindications and accident data from the Consumer Affairs Agency and MHLW, this guide explains unsafe situations and the basics of safe bathing.
Published: Oct 22, 2025
Who should avoid hot springs, and what bathing habits are risky? Based on Japan's Ministry of the Environment contraindications and accident data from the Consumer Affairs Agency and MHLW, this guide explains unsafe situations and the basics of safe bathing.
Published: Oct 22, 2025
Hot springs warm the body and promote circulation, but they also expose you to high temperature, water pressure, sweating, and blood pressure changes at the same time. For that reason, depending on your condition or chronic illness, bathing can become a burden or a risk. Rather than thinking, if it is good for you, it is fine, it is safer to first check whether your body is in a condition that can handle bathing.
To put it simply, the main points fall into two categories. One is people and situations that should avoid bathing, such as acute illness with fever, unstable heart or respiratory disease, or after drinking alcohol. The other is dangerous bathing habits, such as sudden temperature changes, staying too long in very hot water, or not drinking enough fluids. Under Japan's Hot Springs Act, the Ministry of the Environment has defined contraindications that should be posted at hot spring facilities, and the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare continue to warn about bathing accidents.
This article provides an overall view as a safety hub for who should avoid bathing and what habits are risky. For specific guidance on bathing time and frequency, see How Long and How Often to Use Hot Springs. For individual considerations such as menstruation or pregnancy, see Hot Springs During Menstruation.
This article is for general information only and is not medical advice. If you have a chronic condition, are pregnant, or are feeling unwell, do not push yourself based on self-judgment. Consult your regular doctor if needed. If your doctor has restricted bathing, their instructions take priority.
Based on Article 18 of the Hot Springs Act, the Ministry of the Environment specifies general contraindications that facilities must display. These are conditions and illnesses for which bathing should be avoided regardless of the type of spring water. The 2014 revision reflects the latest medical knowledge and is also useful as a reference for bathing at home.
The table below summarizes the Ministry of the Environment's general contraindications together with situations flagged by the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare.
| Category | Main cases | Why |
|---|---|---|
| Avoid bathing (Ministry of the Environment contraindications) | Active phase of illness, especially when fever is present; active tuberculosis; advanced malignant tumors; severe debilitation such as marked anemia; serious heart or lung disease that causes breathlessness with slight exertion; severe kidney disease with edema; gastrointestinal bleeding; visible bleeding; acute worsening of chronic illness | Bathing may worsen symptoms or further exhaust the body |
| Use caution | People with chronic conditions such as high blood pressure, heart disease, or respiratory disease; older adults; children; pregnant people | Reduce the physical burden by using lukewarm water and keeping sessions short, and consult a doctor if unsure |
| Avoid depending on the day's condition | After drinking alcohol or while intoxicated; immediately before or after meals; when overly fatigued; after taking tranquilizers or sleeping pills | Sudden changes in blood pressure and reduced alertness can combine to cause accidents |
In particular, if you have a fever or feel acutely unwell, avoid bathing because your body temperature may rise further and symptoms may worsen. For people with serious heart or lung disease, heat and water pressure can place a major burden on blood pressure and heart rate. If you have bleeding or strong inflammation, increased circulation may make the condition worse. In all cases, if your doctor has restricted bathing, following that instruction is the top priority.
In the 2014 revision, pregnancy was removed from the general contraindications. This is because no scientific evidence has confirmed a causal link between bathing in simple hot springs and miscarriage or preterm birth. However, this does not mean there are no limits. You still need to be careful about dizziness, dehydration, and falls in the bath area. For individual considerations during pregnancy or menstruation, see Hot Springs During Menstruation, and consult a doctor if you have concerns.
Risk is not determined only by the condition of the bather. The way you bathe also matters. Comparing patterns that are especially likely to lead to accidents with safer habits gives the following picture.
| Dangerous habit | Risk | Safer habit |
|---|---|---|
| Moving from a warm room to a cold changing room or bath area and entering very hot water right away | A sudden blood pressure change, known as heat shock, can cause loss of consciousness and drowning in the tub | Warm the changing room and bath area in advance, and let your body adjust with a shower before entering |
| Staying for a long time in water above 42°C | Increases the risk of dizziness, dehydration, and strain on the heart | Aim for water at 41°C or below and avoid long baths |
| Bathing after drinking alcohol or while intoxicated | Low blood pressure and impaired judgment combine to increase the risk of falling or drowning | Drink alcohol after bathing, and first take in fluids and food |
| Repeating baths or sauna sessions without drinking water | Dehydration makes dizziness and lightheadedness more likely | Drink a glass of water before and after bathing |
| Standing up suddenly from the tub | Makes lightheadedness and falls more likely | Stand up slowly and use a handrail |
As concrete measures to prevent bathing accidents, the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare recommend warming the changing room and bath area before bathing, keeping the water at 41°C or below and limiting soaking time to 10 minutes, not standing up suddenly from the tub, avoiding bathing immediately after meals or before alcohol has worn off, and being careful about bathing after taking tranquilizers or sleeping pills. The basics are to reduce temperature differences, keep both water temperature and time under control, and avoid sudden movements.
For more detailed guidance on bathing time and frequency, and on the mechanism of heat shock, see How Long and How Often to Use Hot Springs. For water temperature categories themselves, see Hot Spring Temperature Categories. For the relationship between alcohol, meals, bathing, and hydration, see Food and Hydration After Hot Springs and Sauna.
Accidents during bathing are not rare. According to Consumer Affairs Agency statistics based on the Ministry of Health, Labour and Welfare's Vital Statistics Survey, about 80% of people age 65 and older who died from accidental drowning in 2023 were involved in bathing accidents. These incidents tend to cluster in winter, especially from December to January, when temperature differences are large.
What the numbers show is that even healthy people can face risks depending on temperature differences and bathing habits. In particular, older adults and people with chronic conditions may be placing stress on their bodies even if they feel fine. That is why the basics matter: reduce temperature differences, keep the water temperature and bathing time down, and avoid sudden movements.
If you notice any of the following symptoms, get out of the water right away without trying to endure it.
Rest in a cool place and drink water. If you do not recover or if it is hard to handle the situation alone, tell someone nearby or the facility staff. When bathing with an older family member, checking in regularly makes it easier to notice problems early.
If you have a chronic condition such as high blood pressure or heart disease, keep the water lukewarm and your bathing time short, and consult a doctor in advance if you are unsure about your condition. If your doctor has restricted bathing, their instruction comes first.
In the 2014 revision, the Ministry of the Environment removed pregnancy from the general contraindications, but you still need to be careful about dizziness, dehydration, and falls. Because judgment varies depending on your condition and stage of pregnancy, see Hot Springs During Menstruation for more detail, and consult a doctor if you have concerns.
No. Please avoid it. Alcohol lowers blood pressure, and heat lowers it further, while also reducing judgment. The risk of falling or drowning increases, so if you plan to drink, do so after bathing and after you have first taken in fluids and food.
Warm the changing room and bath area in advance to reduce temperature differences, and let your body adjust with a shower before entering. Keep the water at 41°C or below and limit soaking time to 10 minutes, and do not stand up suddenly. For more detail, see How Long and How Often to Use Hot Springs.
Children warm up quickly because their bodies are small, so avoid hot water and keep sessions short. Check frequently for flushed faces or signs of exhaustion, and do not let them run in slippery bath areas.
The key points about hot springs are knowing who and what should avoid bathing, and avoiding dangerous bathing habits. Skip bathing when you have an acute illness such as fever, unstable heart or respiratory disease, or after drinking alcohol, and avoid sudden temperature differences, long baths in hot water, and dehydration. The Ministry of the Environment identifies contraindications, while the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare warn about bathing accidents. In 2023, about 80% of people age 65 and older who died from accidental drowning were involved in bathing accidents. Keeping water at 41°C or below, limiting time to 10 minutes, reducing temperature differences, and getting out if you feel unwell can greatly lower the risk of accidents and poor health.
Hot springs warm the body and promote circulation, but they also expose you to high temperature, water pressure, sweating, and blood pressure changes at the same time. For that reason, depending on your condition or chronic illness, bathing can become a burden or a risk. Rather than thinking, if it is good for you, it is fine, it is safer to first check whether your body is in a condition that can handle bathing.
To put it simply, the main points fall into two categories. One is people and situations that should avoid bathing, such as acute illness with fever, unstable heart or respiratory disease, or after drinking alcohol. The other is dangerous bathing habits, such as sudden temperature changes, staying too long in very hot water, or not drinking enough fluids. Under Japan's Hot Springs Act, the Ministry of the Environment has defined contraindications that should be posted at hot spring facilities, and the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare continue to warn about bathing accidents.
This article provides an overall view as a safety hub for who should avoid bathing and what habits are risky. For specific guidance on bathing time and frequency, see How Long and How Often to Use Hot Springs. For individual considerations such as menstruation or pregnancy, see Hot Springs During Menstruation.
This article is for general information only and is not medical advice. If you have a chronic condition, are pregnant, or are feeling unwell, do not push yourself based on self-judgment. Consult your regular doctor if needed. If your doctor has restricted bathing, their instructions take priority.
Based on Article 18 of the Hot Springs Act, the Ministry of the Environment specifies general contraindications that facilities must display. These are conditions and illnesses for which bathing should be avoided regardless of the type of spring water. The 2014 revision reflects the latest medical knowledge and is also useful as a reference for bathing at home.
The table below summarizes the Ministry of the Environment's general contraindications together with situations flagged by the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare.
| Category | Main cases | Why |
|---|---|---|
| Avoid bathing (Ministry of the Environment contraindications) | Active phase of illness, especially when fever is present; active tuberculosis; advanced malignant tumors; severe debilitation such as marked anemia; serious heart or lung disease that causes breathlessness with slight exertion; severe kidney disease with edema; gastrointestinal bleeding; visible bleeding; acute worsening of chronic illness | Bathing may worsen symptoms or further exhaust the body |
| Use caution | People with chronic conditions such as high blood pressure, heart disease, or respiratory disease; older adults; children; pregnant people | Reduce the physical burden by using lukewarm water and keeping sessions short, and consult a doctor if unsure |
| Avoid depending on the day's condition | After drinking alcohol or while intoxicated; immediately before or after meals; when overly fatigued; after taking tranquilizers or sleeping pills | Sudden changes in blood pressure and reduced alertness can combine to cause accidents |
In particular, if you have a fever or feel acutely unwell, avoid bathing because your body temperature may rise further and symptoms may worsen. For people with serious heart or lung disease, heat and water pressure can place a major burden on blood pressure and heart rate. If you have bleeding or strong inflammation, increased circulation may make the condition worse. In all cases, if your doctor has restricted bathing, following that instruction is the top priority.
In the 2014 revision, pregnancy was removed from the general contraindications. This is because no scientific evidence has confirmed a causal link between bathing in simple hot springs and miscarriage or preterm birth. However, this does not mean there are no limits. You still need to be careful about dizziness, dehydration, and falls in the bath area. For individual considerations during pregnancy or menstruation, see Hot Springs During Menstruation, and consult a doctor if you have concerns.
Risk is not determined only by the condition of the bather. The way you bathe also matters. Comparing patterns that are especially likely to lead to accidents with safer habits gives the following picture.
| Dangerous habit | Risk | Safer habit |
|---|---|---|
| Moving from a warm room to a cold changing room or bath area and entering very hot water right away | A sudden blood pressure change, known as heat shock, can cause loss of consciousness and drowning in the tub | Warm the changing room and bath area in advance, and let your body adjust with a shower before entering |
| Staying for a long time in water above 42°C | Increases the risk of dizziness, dehydration, and strain on the heart | Aim for water at 41°C or below and avoid long baths |
| Bathing after drinking alcohol or while intoxicated | Low blood pressure and impaired judgment combine to increase the risk of falling or drowning | Drink alcohol after bathing, and first take in fluids and food |
| Repeating baths or sauna sessions without drinking water | Dehydration makes dizziness and lightheadedness more likely | Drink a glass of water before and after bathing |
| Standing up suddenly from the tub | Makes lightheadedness and falls more likely | Stand up slowly and use a handrail |
As concrete measures to prevent bathing accidents, the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare recommend warming the changing room and bath area before bathing, keeping the water at 41°C or below and limiting soaking time to 10 minutes, not standing up suddenly from the tub, avoiding bathing immediately after meals or before alcohol has worn off, and being careful about bathing after taking tranquilizers or sleeping pills. The basics are to reduce temperature differences, keep both water temperature and time under control, and avoid sudden movements.
For more detailed guidance on bathing time and frequency, and on the mechanism of heat shock, see How Long and How Often to Use Hot Springs. For water temperature categories themselves, see Hot Spring Temperature Categories. For the relationship between alcohol, meals, bathing, and hydration, see Food and Hydration After Hot Springs and Sauna.
Accidents during bathing are not rare. According to Consumer Affairs Agency statistics based on the Ministry of Health, Labour and Welfare's Vital Statistics Survey, about 80% of people age 65 and older who died from accidental drowning in 2023 were involved in bathing accidents. These incidents tend to cluster in winter, especially from December to January, when temperature differences are large.
What the numbers show is that even healthy people can face risks depending on temperature differences and bathing habits. In particular, older adults and people with chronic conditions may be placing stress on their bodies even if they feel fine. That is why the basics matter: reduce temperature differences, keep the water temperature and bathing time down, and avoid sudden movements.
If you notice any of the following symptoms, get out of the water right away without trying to endure it.
Rest in a cool place and drink water. If you do not recover or if it is hard to handle the situation alone, tell someone nearby or the facility staff. When bathing with an older family member, checking in regularly makes it easier to notice problems early.
If you have a chronic condition such as high blood pressure or heart disease, keep the water lukewarm and your bathing time short, and consult a doctor in advance if you are unsure about your condition. If your doctor has restricted bathing, their instruction comes first.
In the 2014 revision, the Ministry of the Environment removed pregnancy from the general contraindications, but you still need to be careful about dizziness, dehydration, and falls. Because judgment varies depending on your condition and stage of pregnancy, see Hot Springs During Menstruation for more detail, and consult a doctor if you have concerns.
No. Please avoid it. Alcohol lowers blood pressure, and heat lowers it further, while also reducing judgment. The risk of falling or drowning increases, so if you plan to drink, do so after bathing and after you have first taken in fluids and food.
Warm the changing room and bath area in advance to reduce temperature differences, and let your body adjust with a shower before entering. Keep the water at 41°C or below and limit soaking time to 10 minutes, and do not stand up suddenly. For more detail, see How Long and How Often to Use Hot Springs.
Children warm up quickly because their bodies are small, so avoid hot water and keep sessions short. Check frequently for flushed faces or signs of exhaustion, and do not let them run in slippery bath areas.
The key points about hot springs are knowing who and what should avoid bathing, and avoiding dangerous bathing habits. Skip bathing when you have an acute illness such as fever, unstable heart or respiratory disease, or after drinking alcohol, and avoid sudden temperature differences, long baths in hot water, and dehydration. The Ministry of the Environment identifies contraindications, while the Consumer Affairs Agency and the Ministry of Health, Labour and Welfare warn about bathing accidents. In 2023, about 80% of people age 65 and older who died from accidental drowning were involved in bathing accidents. Keeping water at 41°C or below, limiting time to 10 minutes, reducing temperature differences, and getting out if you feel unwell can greatly lower the risk of accidents and poor health.