Just like anything else too much of anything is bad for you and when using a sauna this is no different. So in order to get the most from a sauna and at the same time be safe you will need to follow some guidelines.
Generally speaking the length of time you spend in a sauna should be around thirty minutes. Some folks stay longer and others for shorter periods of time but thirty minutes is a good measure.
If you are not used to taking saunas then you should work your way up to this. When ever you feel uncomfortable leave the sauna and cool down immediately. If you feel up to it you can return to it again.
The next thing is to ensure that you stay hydrated. We all know that you sweat when in a sauna. As a result of this your body looses water, it is very important that you replenish this otherwise you are in danger of dehydration.
Additionally if you have any health conditions you should consult with your doctor first before using a sauna. This way you can ensure that you will not do more damage than good.
Before taking a sauna you should remove all jewelry. Metal absorbs heat as a result of this you're jewelry may become very hot and uncomfortable.
Like swimming you should not enter a sauna immediately after a meal, instead you should wait a couple of hours. That said you should also enter a sauna on an empty stomach.
If you are recovering from a serious illness then refrain from using a sauna.
These are some guidelines that you should adhere to in order to avoid any health issues when using a sauna.