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Recurrence of seasonal qi diseases refers to the situation where, during the transitions of the four seasons, sudden abnormal climatic factors invade the human body. The pathogenic factor lodges in the skin and muscles, contends with the blood and qi, and accumulates to transform into high fever (Zhuang Re) and headache. After the heat subsides, if the blood and qi have not yet harmonized, and the heat trend within the fu organs has not completely dissipated, early labor or irregular diet may cause the disease to relapse. This is termed "recurrence" (Fu). However, recurrence is often more severe than the initial illness because the blood and qi are already deficient, suffering a secondary injury.

Wen Bing (Warm Disease) occurs when, during the severe cold of winter, a person is exposed to cold pathogens. The cold qi enters the muscles but does not manifest immediately. When spring arrives and warmth stimulates the body, it manifests as headache and high fever, which is called Wen Bing. Additionally, if winter should be cold but turns warm instead, this abnormal climate invades the person and causes immediate onset, also resulting in headache and high fever; this is called Dong Wen Bing (Winter Warm Disease). All pathogenic invasions occur due to exposure to improper climatic factors. Even infants who cannot actively expose themselves may contract disease if their nursing mother, while holding or caring for them, fails to shield them from wind-cold or wind-heat pathogens.

Wen Bing occurs when, during the severe cold of winter, a person is exposed to cold pathogens. The cold qi enters the muscles but does not manifest immediately. By spring, the condition forms, and upon stimulation by warmth, it manifests as headache and high fever, termed Wen Bing. Furthermore, if winter should be cold but turns warm instead, this climate invades the person, causing immediate onset with headache and high fever, termed Dong Wen Bing. In cases accompanied by diarrhea (Xia Li), it is due to pre-existing deficiency in the intestines and stomach combined with infection by warm-heat pathogens. The heat qi enters the intestines and stomach, contending with food and drink. Since the intestines are deficient, diarrhea ensues.

Wen Bing occurs when, during the severe cold of winter, a person is exposed to cold pathogens. The cold qi enters the muscles but does not manifest immediately. By spring, upon stimulation by warmth, it manifests as headache and high fever, termed Wen Bing. Additionally, if winter should be cold but turns warm instead, this climate invades the person, causing immediate onset, termed Dong Wen Bing. Both present with headache and high fever. In cases presenting with epistaxis (Bi Nu), the heat pathogen attacks the qi level and penetrates into the blood level. The Lung governs the skin and hair, controls Qi, and opens into the nose. In Wen Bing, the pathogen first lodges in the skin, contends with Qi, aggregates into heat, and then the heat penetrates the blood. Blood heated becomes turbulent and scatters, flowing out from the nose, which is defined as Bi Nu (epistaxis).

When observing heat diseases, if the patient exhibits dryness in the nose indicating impending epistaxis, and previous attempts at sweating therapy failed to produce sweat, or if no sweat occurred since the initial infection, accompanied by nasal dryness, panting, and audible breathing sounds from the nose, epistaxis will inevitably occur. If an infant experiences epistaxis and the bleeding stops after losing one sheng to several he (a small unit of volume), the heat will subside. However, if the bleeding reaches one dou or more (a large unit of volume), death will result.