
Saunas can be a wonderful way to relax and unwind, but like any other activity, they can also come with some health risks. Prolonged exposure to high temperatures can cause dehydration, especially if you're not drinking enough water before, during, and after your sauna session.
Dehydration can lead to headaches, dizziness, and even heat exhaustion or heat stroke in extreme cases. According to a study, heat stroke is a leading cause of death in Finland, where sauna use is a common practice.
To avoid dehydration, make sure to drink plenty of water before and after your sauna session. The American Heart Association recommends drinking at least 8-10 glasses of water per day, and even more if you're physically active or live in a hot climate.
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Health Risks
Dehydration is a significant risk when using a sauna, especially if you're not replenishing fluids adequately. This can lead to overheating and heat exhaustion, characterized by symptoms like dizziness and nausea.
Prolonged exposure to the heat in a sauna can cause blood pressure to fall or rise, potentially problematic for those with heart conditions. This is especially true for people who take blood pressure medication, who should be especially careful not to push themselves too hard.
If you experience dizziness, headaches, or lack of vision during a sauna session, it's best to sit down and drink water to cool down. This can help prevent further complications.
Here are some common health risks associated with sauna use:
- Dehydration and overheating
- Blood pressure fluctuations
- Blood pressure plummeting, causing dizziness, headaches, and lack of vision
- Increased risk of complications for people with cardiovascular disease
Cardiovascular Diseases
If you have cardiovascular disease, you should exercise caution when using a sauna. The heat can stress your cardiovascular system, making your heart beat faster and increasing your blood pressure.
This can cause discomfort, and in rare cases, even complications. It's essential to consult your doctor before visiting the sauna.
If you have a history of heat stroke or heat exhaustion, it's best to avoid using a sauna altogether. The intense temperatures and humidity can cause further harm and increase your risk of dangerous complications.
Here are some specific risks to be aware of:
- Dehydration: Prolonged sweating can lead to dehydration if fluids are not replenished.
- Overheating: Prolonged exposure to heat can cause overheating and heat exhaustion.
- Blood Pressure Fluctuations: Saunas can cause blood pressure to fall or rise, potentially problematic for those with heart conditions.
May Not Eliminate All Harmful Organisms

Saunas may not be as effective as you think at killing off all the bacteria and viruses that can cause harm. Some bacteria and viruses can actually survive the heat of a sauna.
It's essential to remember that good hygiene is crucial when using a sauna. This means washing your hands before and after use, and showering after each session.
Precautions and Contraindications
Pregnant women should be cautious when using saunas, as extreme heat can be harmful to the fetus.
Individuals with heart conditions or low blood pressure should also avoid sauna use altogether.
Those with respiratory issues should be aware that the hot air can exacerbate breathing problems.
Drinking water from a sauna can be DANGEROUS because it may contain bacteria or other contaminants.
It's best to avoid drinking the water from a sauna altogether and stick to drinking bottled water instead.
If you're unsure about your health or any potential risks, it's always a good idea to consult with a medical professional before using a sauna.
Who Should Avoid?
If you're planning to use a sauna, there are certain individuals who should exercise caution or avoid it altogether. Pregnant women should be especially careful, as extreme heat can be harmful to the fetus.
Pregnant women should avoid saunas as a precautionary measure to ensure the health and well-being of their unborn child.
Individuals with heart conditions or low blood pressure should also be cautious, as the heat can put a strain on their cardiovascular system.
Those with respiratory issues, such as asthma or chronic obstructive pulmonary disease (COPD), should avoid saunas as the hot air can exacerbate breathing problems.
The following individuals should be cautious or avoid sauna use:
- Pregnant women
- Individuals with heart conditions or low blood pressure
- Those with respiratory issues
Avoid for weight loss
Using a sauna for weight loss is not recommended. Dehydration and electrolyte imbalances can be a result of frequent sauna use, which can be dangerous for your health.
Any weight lost in a sauna is likely to be regained once you stop using it. This is because sauna weight loss is not sustainable.
Weight loss can be achieved through healthy eating habits. Studies have shown that eating a balanced diet is essential for losing weight and keeping it off.
Reducing stress levels is also crucial for weight loss. Exercise regularly and focus on overall wellness, not just quick fixes.
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Medication
Certain medications can increase or trigger nausea, so it's essential to discuss this with your doctor before visiting the sauna.
Some medications, especially those that affect the cardiovascular system, may interact with sauna heat and increase nausea. This is a crucial consideration before heading to the sauna.
Before visiting the sauna, talk to your doctor about any medications you're taking and whether it's advisable to discontinue them, especially if they can increase nausea.
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Safety and Precautions
Sauna safety is crucial, especially when you're feeling under the weather. Always listen to your body and exit the sauna if you feel dizzy or unwell.
Drinking plenty of water before, during, and after your sauna session is essential. This helps prevent overheating, exhaustion, and dehydration, which can exacerbate your sickness.
Limiting your time in the sauna is vital. Start with short sessions and gradually increase as tolerated to avoid overexertion. Most people find it helpful to start with 10-15 minute sessions and gradually increase as they become more comfortable.
Hydration is key, but it's also important to cool down naturally after your sauna session. Avoid taking a cold shower unless recommended by a healthcare professional, as this can cause a sudden drop in body temperature.
Here are some essential sauna safety tips to keep in mind:
- Stay hydrated by drinking plenty of water before, during, and after your sauna session.
- Limit your time in the sauna and start with short sessions.
- Cool down naturally after your sauna session.
- Listen to your body and exit the sauna if you feel dizzy or unwell.
Remember, it's always better to err on the side of caution when it comes to your health. If you're feeling unwell, it's best to skip public saunas and opt for a private session at home instead. This will help prevent the spread of infection to others and allow you to rest and recover properly.
Physical Effects
Saunas can cause dizziness, which can trigger nausea. This is often due to the sudden change between hot and cold air.
Overheating is another potential issue when using a sauna. Staying too long in the sauna can cause your body temperature to rise too high, leading to nausea.
People with low blood pressure should be cautious when using a sauna, as it can cause blood pressure to fall. This can lead to fainting if you stand up too quickly.
The heat from the sauna can also cause arrhythmias, or irregular heartbeats, especially if you're prone to them. Dehydration can exacerbate this issue, leading to sudden hyperthermia.
The body's adaptation to high temperatures in the sauna can cause nausea in some people. This is because the body tries to increase blood flow and speed up the heartbeat to cope with the heat.
Taking regular breaks and slowly adjusting to the heat can help prevent overheating and nausea.
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Environmental Factors
Using a sauna can be a great way to relax, but it's essential to consider the environmental factors that can make you sick.
Inadequate ventilation can lead to a buildup of moisture and heat, creating an ideal environment for bacteria and viruses to thrive.
Saunas can also be breeding grounds for Staphylococcus aureus, a type of bacteria that can cause skin infections.
If the sauna is not properly maintained, it can harbor mold and mildew, which can exacerbate respiratory issues like asthma.
The temperature and humidity levels in a sauna can also cause dehydration, especially if you're not drinking enough water before, during, and after your session.
Debunking Common Myths
Some people think saunas are harmless, but that's not entirely true. Certain health conditions can make sauna use a bad idea.
Individuals with health conditions like high blood pressure or heart problems should think twice before stepping into a sauna. Sauna use can be a heart strain, especially for those with pre-existing conditions.
The idea that saunas are a great way to lose weight is a myth. Any weight lost in a sauna is mostly water weight, not fat loss. You'll likely regain that weight once you rehydrate.
Saunas might make you feel relaxed and calm, but they're not a detoxifying magic trick. The liver is the primary detoxifying organ in the body, not the skin.
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