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During the spring and autumn seasons, people may contract mountain miasma, pestilential fog, and toxic vapors, leading to alternating chills and fever, fullness and oppression in the hypochondrium and diaphragm, and loss of appetite. This occurs because the toxic vapors enter through the nose and mouth. Treatment should focus on clearing the Upper Jiao (Upper Burner), resolving internal toxins, moving Qi, and descending phlegm. Sweating methods should be avoided, as the warm climate in Lingnan makes sweating easy. In severe cases, chills and fever persist; in mild cases, it manifests as malaria (Malaria). Due to the ascending nature of Qi in the South, patients in Lingnan often suddenly experience obstruction of phlegm and saliva in the chest and diaphragm, with inability to eat or drink. This differs from Northern Cold Damage (Shanghan) diseases, which only affect the exterior while the interior remains harmonious.

Plague refers to a situation where many people suffer from the same illness simultaneously, known as "Heavenly Traveling Seasonal Epidemic" (Tianxing Shi Yi). There are three treatment principles: tonification, dispersal, and clearing heat. In severe cases, add child's urine (Tongbian) or Renzhonghuang (Processed Licorice Root) to these methods. When entering a patient's home, one must avoid their pathogenic qi to prevent infection. Powdered Realgar (Xionghuang) can be applied to the nostrils, and one should enter from the guest's position. Generally, when men are ill, foul odor emanates from the mouth; when women are ill, it emanates from the vaginal opening. During sitting or standing face-to-face, one must be aware of orientation and back-facing.

For conditions with exterior symptoms requiring sweating, use Qianghuo Chonghe Tang (Qianghuo Harmonizing Decoction) added with Chaihu (Bupleurum Root), Danggui (Angelica Sinensis Root), Shaoyao (Peony Root), Ziye (Perilla Leaf), and Congbai (Scallion White) to rapidly disperse exterior pathogens and prevent them from penetrating inward. This is the primary principle for preserving pregnancy. If there are interior excess-heat symptoms, such as constipation, dryness, and thirst, Dahuang (Rhubarb Root) should be used for purgation, but it must be processed with wine. It should be combined with Siwu Tang (Four Substances Decoction) to protect healthy qi, thereby avoiding harm to the fetus. If true cold syndrome is present, characterized by a hidden pulse and cold extremities, Jiang (Dried Ginger), Rougui (Cinnamon Bark), and Fuzi (Prepared Aconite Root) should be used. Although Fuzi and Rougui are hot, their toxicity is neutralized by Huanglian (Coptis Rhizome) and Gancao (Licorice Root). Moreover, severe cold or heat conditions must be removed promptly to prevent fetal damage. The disease bears the brunt of the medication; stop once the condition improves, without exceeding dosage limits. Externally, mud from the bottom of a well, Qingdai (Indigo Naturalis), and Fulonggan (Vermilion Dragon Liver - calcined hematite) can be mixed and applied around the pregnant woman's umbilicus (approx. 2 cun). Reapply if dry, to protect the pregnancy. However, this is contraindicated for those with deficiency-cold of the intestines and stomach, accompanied by aversion to cold and diarrhea.

Postpartum Cold Damage (Shanghan) should not be treated lightly with sweating or purging methods, fearing further depletion of strength after childbirth. Fever postpartum may result from excessive blood loss, incomplete lochia discharge, lactation onset (steaming milk) on the third day, early physical labor, or food stagnation. All these cause fever and aversion to cold, resembling Cold Damage. One should not immediately use exterior-releasing or interior-purgative formulas. However, if postpartum fever and aversion to cold are due to incomplete lochia, there will necessarily be distension and fullness in the hypochondrium extending to the lower abdomen, with painful masses. If caused by food stagnation, fever and headache will be accompanied by belching with acid reflux, aversion to food odors, chest and diaphragm fullness, and a tight pulse at the right Guan position. If caused by lactation, there will be distension, hardness, and pain in the breasts; massaging the breasts to promote milk flow will resolve the heat spontaneously without medication. If the condition is truly due to negligence postpartum, resulting in deficiency and external contraction, Siwu Tang (Four Substances Decoction) should be used with wind-dispelling herbs. The degree of sweating should be determined by the balance of healthy qi and the severity of the pathogen. If heat pathogens transmit inward, causing dryness, thirst, constipation, deep and solid pulse, and delirium due to severe heat, severe cases require purgation using Siwu Tang plus Chaihu, Huangqin (Scutellaria Root), Zhike (Aurantium Fruit), and Shu Dahuang (Prepared Rhubarb). Mild cases use honey suppositories (Midao). After purgation, use Siwu Tang with a small amount of Ganjiang (Dried Ginger) and large doses of Renshen (Ginseng Root) and Baizhu (Atractylodes Macrocephala Rhizome) to warm and tonify blood and qi. If heat transmits to the half-exterior half-interior level, use Siwu Tang combined with Xiaochaihu Tang (Minor Bupleurum Decoction). However, given the significant deficiency of blood and qi postpartum, the main treatment for all diseases should be major tonification of blood and qi. Even with miscellaneous symptoms, they should be treated secondarily, let alone sweating and purging.