A very hot shower after a very cold bath isn't actually that healthy, I've heard. But I don't remember why!,(reply>), It changes your bloodpressure very quickly. The opposite is more dangerous (going from warm to cold) as it causes volume of your vein to decrease dramatically, and could cause you to pop blood-vessel in your brain. Rare thing but can happen to old people.,(reply>), @Cleodel I think it has more to do with your blood viscosity actually. Just an educated guess, most of the information I have found on the subject seems to avoid saying it is anything spicific. mainly it just claims that temperature change is hard on your body without really getting into it.,(reply>), I wonder if in less severe cases (aka, when shock wouldn't be a factor) it has something to do with the inability to accurately sense the temperature change? So, perhaps you'd be more likely to burn yourself? ,(reply>)," From <a href=""http://www.webmd.com/first-aid/hypothermia-treatment"">http://www.webmd.com/first-aid/hypothermia-treatment</a><br>Hypothermia Treatment<br><br>Restore Warmth Slowly<br>Get the person indoors.<br>Remove wet clothing and dry the person off", if needed.<br><br>Warm the person's trunk first, not hands and feet. Warming extremities first can cause shock.<br>Warm the person by wrapping him or her in blankets or putting dry clothing on the person.<br>Do not immerse the person in warm water. Rapid warming can cause heart arrhythmia.<br>If using hot water bottles or chemical hot packs, wrap them in cloth; don't apply them directly to the skin,<br><br><br>I had moderate hypothermia a couple of years ago, violent shivering, etc. I got into a warm shower, but kept my arms out of the water. I gradually increased the temperature. It took about 40 minutes before I stopped shivering. I looked up the treatment afterwards. I had no ill effects, but I wish I had known the proper treatment before.,(reply>), Here's the reason:<br>When your limbs get very cold your blood in them gets cold, too. To prevent the cold blood getting in your inner body the blood vessels become very narrow. Now when you warm your hands very quick your body thinks everything is ok now and opens the veins again. Problem is, the blood is not heated jet.