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Chi (Slow) and Shu (Rapid) pulses refer to the slowness and rapidity of the pulse. When Qi and Fire are excessively abundant, the pulse comes rapidly; beating six or seven times per respiration is defined as Shu (Rapid) [Shu Mai (Rapid Pulse)], belonging to Yang and Heat patterns, mostly Excess syndromes. When Qi and Blood are depleted and weak, the pulse comes lethargic and slow; beating two or three times per respiration is defined as Chi (Slow) [Chi Mai (Slow Pulse)], belonging to Yin and Cold patterns, mostly Deficiency syndromes. Although there are occasional cases where Middle Qi is insufficient leading to a virtual Rapid pulse, or where solid pathogenic accumulation causes stagnation in the pulse vessels, generally speaking according to pulse theory, Shu indicates Excess (redundancy), while Chi indicates Deficiency (insufficiency). Therefore, in the stage of Zhongyang (Swollen Ulcer / Pre-ulcerative abscess), if the pulse is Shu (Rapid), it indicates an excess of pathogenic factors; the disease momentum is rising, and the toxicity is strong, so the pulse image must correspondingly be both Shu (Rapid) and Ji (Hurried). If accompanied by fever, the pulse is Shu (Rapid), large, and Hong (Surging); if pus has already formed, the pulse is Jin (Tight), Shu (Rapid), and Shi (Excess). When the pulse and disease match, this is the normal state. After the ulcer has ruptured (Ji Kui), when the toxicity has been discharged, a quiet and peaceful pulse is auspicious. If the pulse remains Shu (Rapid) and Ji (Hurried) without decrease, it indicates that residual heat is not yet cleared and residual toxins are not yet resolved. If this occurs immediately after rupture, it poses no major danger; resolving pathogens and clearing heat will lead to recovery. However, if the condition persists for a long time, Zheng Qi (Upright Qi) declines daily while Xie Qi (Pathogenic Qi) does not diminish, and the Shu (Rapid) pulse does not recede, or if the pulse is Shu (Rapid) and large with a hollow center (Kou Pulse), or thin, Shu (Rapid), and hurried, the patient's form and spirit will inevitably become exhausted, and Zhen Yuan (True Yuan/Original Qi) will perish; this constitutes a Huai Zheng (Bad/Incurable Syndrome). A Chi (Slow) pulse during the Zhongyang (Swollen Ulcer) stage mostly indicates insufficiency of Zheng Qi (Upright Qi); the pulse and disease do not correspond, which is definitely not a good omen. This is only seen occasionally in individuals with weak constitutions and should not occur in ordinary ulcers. Only in conditions such as Fugu Ju (Bone-attached Abscess) and Huantiao Ju (Huantiao Abscess), where the etiology is Deficient-Cold, presenting initially with sour pain and tendon contraction, a Chen (Deep) and Chi (Slow) pulse is correct. Applying Wenyang Shujing (Warming and Nourishing to Soothe the Meridians) allows the toxicity to resolve naturally. In cases of Nao Ju (Neck Carbuncle) and Bei Ju (Back Carbuncle), where Cold Pathogen resides in the meridians, a Chi (Slow) pulse is also a corresponding normal finding. Applying Wenjing Xuantuo (Warming the Meridians and Promoting Expulsion) yields good results. If these specific conditions are not present, then a Yang disease presenting with a Yin pulse requires investigation into its cause. After rupture, when the pathogenic momentum has declined, a Chi (Slow) pulse may seem appropriate; if the physical signs and symptoms are favorable, treating by nourishing the Stomach and regulating Yuan Qi (Primal Qi) is the correct approach. Alternatively, if there is mental fatigue and deficient Qi, it indicates residual toxins are not cleared and Zhen Yuan (True Yuan/Original Qi) is about to dissipate; a pulse arriving without Shen (Spirit/Vitality) is also not an auspicious sign.