The worst issues with a hot shower are that it’s more costly and it can dry your skin out. A cold shower is for when you are trying to cool down, you are trying to save money, or to help with dry skin ( or you have no other option ).
Some people use a cold shower to wake up since it might shock you awake a bit.
For most people you should probably just use warm/lukewarm water but it all depends on a variety of factors and preferences. If you want more potential health benefits you would go for more extreme temperatures like a sauna, hot spring, an ice bath, or cryotherapy.
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