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Warm disease (Wen Bing) arises when, during the winter season of severe cold, a person is exposed to and contracts cold pathogenic factors. The cold qi enters the muscles but does not manifest immediately. When spring arrives and warmth prevails, the disease erupts, presenting with headache and high fever; this is termed Warm disease. Additionally, if winter should be cold but instead becomes warm, this abnormal climate injures the human body, causing immediate onset of illness, known as Winter-warm disease (Dong Wen). Both conditions present with headache and high fever. Generally, for warm-heat diseases, after four or five days, if the heat penetrates inward, resulting in internal heat and abdominal fullness, purgation (Xia Fa) is indicated. If the heat has not yet entered the interior and purgation is applied prematurely, it causes deficiency in the interior and rebellious Qi. The heat then knots in the chest region, leading to chest oppression, fullness, and shortness of breath; this is termed Jie Xiong (Chest Binding).

Ban Du (Plague-toxin disease) occurs when heat enters the Stomach. Since the Stomach governs the muscles, the heat carries toxin, which accumulates and stagnates within the Stomach. The toxic vapors fumigate and erupt into the muscles. The presentation resembles bites from mosquitoes or fleas, with red macules rising and covering the entire body circumference. This disease may originate from Cold Damage (Shang Han), seasonal epidemic Qi, or Warm disease. All result from persistent heat that does not cease, allowing heat to enter the Stomach, transform into toxin, and subsequently manifest as macules. For those developing red macules, nine out of ten survive and one dies; for black macules, one out of ten survives and nine die.

Huang Bing (Jaundice/Yellow Disease) occurs when heat enters the Spleen and Stomach. The heat qi accumulates and stagnates, battling with the Qi of food and grain, evaporating outward. Consequently, the skin becomes entirely yellow, and the eyes also turn yellow. The Spleen and Stomach are exterior-interior paired, both symbolizing Earth, governing the muscles, and corresponding to the color yellow. Thus, internal heat accumulation and evaporation in the Spleen and Stomach cause the skin and muscles to become yellow. This condition may stem from Cold Damage, seasonal epidemics, or Warm disease, all due to heat failing to resolve over time, thereby entering the Stomach.
If yellowing is accompanied by diarrhea and abdominal fullness, the prognosis is fatal. If the pulse is deep and fine, the prognosis is fatal.
Infants aged between 100 days and half a year who exhibit slight yellowing of the body, unrelated to Cold Damage or Warm disease, also suffer from Stomach heat. Moxibustion must strictly be avoided. Applying moxibustion will exacerbate the heat. This condition results from improper nursing care. One should reduce clothing layers and frequently apply cooling powder dispersants. Once the powder is applied, the heat will subside naturally. Do not arbitrarily administer decoctions or perform moxibustion.

Huang Dan (Jaundice) arises from excess Qi in the Spleen and Stomach, compounded by external warm pathogens invading and transforming into heat. The Spleen and Stomach are exterior-interior paired, governing the muscles, symbolizing Earth, and corresponding to the color yellow. The Stomach is the sea of water and grain. Heat battles with the Qi of water and grain, accumulating and stagnating to form jaundice. Evaporating outward, it causes body pain, stiffness in the shoulders and back, and difficulty in urination and defecation. The skin, face, eyes, teeth, and nails all turn yellow. The urine resembles the color of house dust, staining clothes yellow. If urination is smooth and free, the disease is easy to treat; if there is abdominal fullness and difficult urination, it is difficult to treat. If there is no thirst, it is easy to treat; if there is thirst, it is difficult to treat. A deep, fine pulse accompanied by abdominal fullness indicates a fatal prognosis.