Weather and the incidence of urinary stone colic in Tokyo

One hundred and thirty-four episodes of stone colic occurring in one center in 1984 were studied. Urinary stone formation was frequent in the hot season. Actual daily climatic factors which provoked the stone to cause colic were examined. Falling barometric pressure was followed by a high incidence of colic, and rising pressure was followed by a low incidence. Falling air temperature in the cold season and rising temperature in the hot season were associated with high incidence of colic.