Kidneys are enjoying warm , thus a true,that in kidney colics prescribing warm bath.

 But bath is a most affecting on the skin, she warms kidneys, not loading theirs. Sauna affecting other. She's restoring water balance for organism, thus liquid intensively   removing through pores this is relieving kidneys work, thus patients with removed kidneys after sauna are feeling better. And benefit such procedures add to specially drinking kidney teas. And in a cure cold kidneys, loosing own cellular tissues using such procedures before 20 min till  steam-room visiting or Finland sauna drink one glass or more sudorific kvas, if skin sweats bad,     her need to wash with sudorific tea.

In a good sweating, kidneys are rest and faster growing an own cellular metabolism, so as in blood containing enough quantities  for kidneys nourishing substances.And benefit use birch broom, and avoiding are  cold procedures, as cooling stopping sweating process, and weak  kidneys are risks for cold.And  benefit to put on the kidneys oats poultices, and drink water , of infused oats, with honey adding.