summerheat which is a yang pathogenic influence, easily disturbs the heart (yin organ), causing fever and irritability. it also causes sweating and easily injures the fluids, leading to thirst. urinary difficulty arises from a combination of summerheat injuring the qi, and dampness obstructing the interior; together these processes interrupt the transformation of bladder qi. the tongue signs reflect relatively mild damp-summerheat, as does the soggy (damp) and rapid (summerheat) pulse.

(bensky & barolet)