HI Ya'll,
May I add some ideas as to what actually takes place chemically in the body when one gets Hot and then gets cold Quickly!!

Heat causes the body to become more Acidic, because of the Nitrogen in the body which is a form of Protein is an isotope, and heat causes this isotope to take the form of an acid.

Now if one takes a 30 minute very hot tub soak in Epsom Salt 2# and baking soda 1# and hydrogen perxoide 1 pint to one quart this will draw the acids out of your body and draw the nitrogen to the skin surface.
Then if you will shower off with a cold shower, the cold shower will convert the nitrogen isotope into the isotope form of Ammonia which is highly Alkaline.

This is an excellent way to raise your body pH and get rid of excess Acids!!

But beware with this tub soak if you are very sick, and reduce the amount of ingredients and soak time at first and have someone to help you get out of the tub, because it will drain all your energy out.

I have a good friend who used only some of the ingredients in his tub and the water turned BLACK from the poisons which were pulled out of his body and he didn't have enough energy to get out of the tub.

But it really works to raise the body pH from being too Acidic.

Smile Tis your choice.