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This is due to the deficiency and scarcity of body fluids after sweating, combined with latent heat in the Small Intestine (Small Intestine), resulting in the obstruction of urination.

This refers to a condition where both Yin and Qi are biased towards deficiency, making one susceptible to toxic pathogens. If the symptoms include heavy body, pain in the waist and spine, restlessness, red face with macules, sore throat, or diarrhea with mania and running about, this is termed Yang Toxin (Yang Du). If the symptoms include heavy body, stiff back, shortness of breath, vomiting and regurgitation, cyanotic lips, blackish complexion, and cold limbs, this is termed Yin Toxin (Yin Du). Whether the toxin develops after several days of illness or is present from the onset, urgent treatment according to the syndrome is required. Delaying treatment will lead to death.

In seasonal febrile diseases (Shi Qi Bing), damp-toxic qi is abundant and accumulates in the Spleen and Stomach. Heat in the Spleen and Stomach causes newly ingested food to stagnate and steam, preventing digestion. This leads to constipation and difficult urination, causing the body and face to turn yellow, resembling the color of an orange peel or peach branch.

After the illness, pathogenic factors have not dissipated, and Yin and Yang remain deficient. Engaging in labor causes these two Qi to contend; if Yin prevails, chills occur; if Yang prevails, fever occurs. This results in alternating chills and fever, occurring intermittently, forming Malaria (Nüe).

This refers to residual toxins remaining after illness, with changes in physical manifestations that persist without recovery for a long time, leading to a loss of regulatory order between Yin and Yang, named Debilitating Disease (Bai Bing).

For those whose illness has just resolved, Blood and Qi are still deficient, and body fluids have not yet recovered. Immediate labor will cause recurrence. Mental exertion such as speaking or thinking damages the Spirit (Shen); physical exertion such as combing hair or bathing damages strength. Forcing labor beyond capacity generates heat, which returns to the meridians, causing disease again, known as Labor Recurrence (Lao Fu).

For those whose illness has just resolved, the Spleen and Stomach are still weak, and Gu Qi (Grain Qi) has not recovered. Consuming fatty meats, fish, pastries, dates, chestnuts, etc., immediately leads to indigestion, accumulation in the intestines and stomach, causing distension and hardness, followed by recurrent fever and illness, known as Food Recurrence (Shi Fu).

For those whose illness has just resolved, Yin and Yang Qi are not yet harmonized. Early sexual intercourse causes swelling of the genitals extending into the abdomen and abdominal pain, known as Intercourse-induced Labor Recurrence (Jiao Jie Lao Fu).

Yin-Yang Exchange Disease (Yin Yang Yi Bing) occurs when a man or woman who has recently recovered from a seasonal febrile disease but has not fully stabilized engages in sexual intercourse with another person, transmitting the disease. If a man recovers and transmits it to a woman through intercourse, it is called Yang Exchange (Yang Yi). If a woman recovers and transmits it to a man through intercourse, it is called Yin Exchange (Yin Yi). No exchange occurs between two men or two women. It is called "Exchange" because Yin and Yang mutually influence each other, and the toxin transfers to the other person, like a substitution. The symptoms include heat rushing to the chest, heaviness of the head making it difficult to lift, eye discharge, spasm and stiffness of the four limbs, lower abdominal pain, and clenched fists and toes, which can lead to immediate death. In cases where death does not occur immediately, the patient suffers from urgency in the lower abdomen, heat rushing to the chest, heaviness of the head, sensation of joints separating, slack and weak meridians, deficiency of Qi and Blood, exhaustion of Marrow, mental confusion, faint breathing, decreasing strength, inability to move while lying down, dependence on others for daily activities, and may die after months or years.