A brief explanation of each is provided. Wind - This is a yang pathogenic influence. Wind disharmonies are characterized by a sudden onset such as the common cold. As the wind disharmony takes hold, the symptoms turn to heat as yin transforms to yang to show fever, sore throat, dry mouth and thick yellow phlegm. Internal liver wind is very serious and can lead to conditions such as epilepsy and stroke.
Wind is related to spring according to the five elements theory.
This suggests that an individual is more susceptible to external wind disharmonies in the spring. Fire - This also is a yang pathogenic influence. It has a drying effect on the body fluids causing dry skin, constipation, and scanty urine. Cold - This is a yin pathogenic influence. Sudden onset leaves the individual feeling chilly and headachy with an aversion to cold, general body aches and no sweating.