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When measles is complicated by dysentery, it is called "Measles Complicated with Dysentery" (Ma Zhen Jia Li). This is caused by toxic heat that has not yet resolved, shifting to the Large Intestine. If abdominal pain occurs with an urge to defecate, and the stool is red, white, or a mixture of both, the primary prescription should be Qing Re Dao Zhi Tang (Clear Heat and Guide Out Stagnation Decoction). If the dysenteric stool appears purple and dark, resembling pus from a carbuncle, or resembles the color of dripping roof water, chicken liver, or black bean juice, accompanied by panting, irritability, thirst, hiccups, and inability to eat, these are all intractable conditions. If diarrhea or dysentery occurred during the eruption phase of measles and was not cleared and resolved, after the measles subsided, it may transform into Resting Dysentery (Xiu Xi Li), characterized by tenesmus and frequency without limit day and night. This indicates residual toxins remaining in the Large Intestine; medication must be differentiated based on excess or deficiency patterns. For excess patterns, San Huang Wan (Three Yellows Pill) is used to purge; for deficiency patterns, Xiang Lian Wan (Aromatic and Coptis Pill) is used to harmonize. Subsequently, Huang Qin Tang (Scutellaria Decoction) is used to nourish blood and promote qi circulation. When blood is harmonized, bloody stools heal spontaneously; when qi moves freely, tenesmus is eliminated. This is the principle being described.

Constipation in patients with measles results from fire pathogens accumulating and knotting in the Large Intestine, failing to resolve, thereby causing toxic pathogens to attack internally. Therefore, regardless of whether it occurs early or late in the disease course, administering moistening and purgative herbs is harmless. Reddish and scanty urine with painful difficulty in urination is a normal manifestation during the initial eruptive stage. However, if it appears during the resolution phase or after resolution, it indicates lingering toxins that have not dispersed, and Dao Chi San (Guide Out Redness Powder) should be used for treatment. If urination remains obstructed, it may be due to fecal impaction; once the bowels are unblocked, urination will naturally flow freely.

Generally, if measles presents with mild heat, calm spirit, and steady breath, with normal waking and sleeping states, this is auspicious. However, if during the feverish eruptive stage the patient falls into a deep, lethargic sleep, it indicates internal depression of fire pathogens that have failed to vent to the exterior. It is urgent to use potent herbs to ventilate and release the exterior, assisted by heat-clearing agents, to prevent future complications. If such symptoms appear during or after the resolution of measles, but the heat has subsided and the spirit is clear, excessive sleep serves to nourish primordial qi and restore vital energy, posing no harm. Conversely, if the patient is comatose, unconscious, insensible to pain or itch, or exhibits a state of semi-consciousness, these are all intractable conditions. Another presentation involves facial swelling and closed eyes, which is caused by flourishing fire in the Spleen Meridian. Treatment should employ Xie Huang San (Drain Yellow Powder) combined with diuretic methods; once the fire recedes, the eye closure will naturally resolve.

Post-measles fever leading to Gan syndrome (malnutrition syndrome) initially presents with nocturnal body heat and spontaneous sweating, which then subside. Or, in the late afternoon, there is facial flushing, mental fatigue, drowsiness, slight fever relieved by sweating, repeating daily. Early intervention is required, primarily using Huang Lian Jie Du Tang (Coptis Decoction for Resolving Toxicity). If treatment is delayed or neglected, over a period of forty to fifty days, one hundred days, or even one to two years, the patient's physique becomes increasingly emaciated, the abdomen distends, and diarrhea persists, rendering the condition incurable.