unless there is the actual physiological need, urinating symbolizes the recovery of feelings when deformed feelings, including sexuality, leave the body with urine.
urine leaving the body: can also represent sperm; urinating in a dream can also have a physiological basis, and in fact be that the dreamer is experiencing a seminal emission (involuntary ejaculation).
kidneys and urination: cleanse the emotional content of the dreamer’s mind and recently experienced feelings.
a child urinating or having wet himself: the root from which sexuality grows.
urine is the childish form of infantile sexuality; the first childish manifestation that later develops into sexuality; sometimes, especially with children, the urination of a loved one can be an expression of love.
wetting a bed: if children wet the bed, then the unconscious is trying to limit the power of developing sexuality through a childish form of sexuality that is easier to control; but if an adult wets the bed, then the dreamer must come to terms in his dream with unpleasant problems of deformed feelings.
drinking urine (seeing it drunk or drinking it yourself): points to the dreamer's ill feelings and the subconscious attempt at healing.
urine as a healing liquid: especially works on healing instinctual personifications.