The Liver does tend to be particularly vulnerable to Wind, the Spleen to Dampness, the Heart to Heat, and the Lungs to Dryness. In many places in the world the spring does tend to be the most windy time of the year, the summer the hottest, the late summer the most humid, the fall dry, and the winter cold. There will tend to be an increase in certain problems during or immediately following certain seasons. For example, the Liver is the Yin Wood Organ, and cases of infectious hepatitis and cases of pink eye do tend to be more numerous in the spring than at other times of the year. Some people do tend to have kidney and bladder problems more often and more severe in the winter than at other times of the year.
Some people do tend to have more digestive system problems when it's very humid.
But this is not all there is to the 5 Element Theory. The 5 Element Theory also maps relationships between Elements which have practical applications both in diagnosis and treatment. One of the best known of these 5 Element relationships is the Mother-Son rule. This states that if one tonifies the Mother, the Son automatically is tonified. If one sedates the Mother, the Son automatically is sedated.