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Blood accumulation (Xue Xu) refers to the condensation of blood stasis within the interior. This condition arises because pathogenic heat and blood contend with each other, causing blood to stagnate and fail to circulate, thereby forming this syndrome. The Classics state: "In Taiyang disease, pathogens follow the meridians into the interior; blood stasis remains inside. Blood is contended by heat, fails to move, and accumulates in the Lower Jiao." However, if blood accumulates in the upper part, it leads to manic delirious speech; if blood accumulates in the lower part, it leads to a state resembling mania. If there is urgency and fullness in the lower abdomen, difficulty in urination, or conversely, free urination accompanied by black stools, these are definitive signs of blood accumulation. It is appropriate to use agents that are salty, cold, bitter, and purgative to overcome blood stasis, such as Didang Tang (Vital Force Decoction). If urination is difficult, it indicates that body fluids are stagnant and condensed; one should promote urination. If urination is normal and free, it indicates a blood accumulation syndrome, and purgative methods can be used to evacuate the blood stasis.

Impaired bladder function leading to urinary retention is called Long (Ling), while loss of control leading to enuresis is called Yiniao. If Kidney Qi is deficient, the Bladder's Qi lacks restraint, resulting in involuntary urination without the patient's awareness. The treatment method must distinguish between Yin/Yang and Deficiency/Excess. If Excess Yang pathogens cause delirium, severe heat, coma, and enuresis, one should clear the Heart and resolve heat. If Yin pathogens cause Jue (cold extremities/reversal), a faint pulse, extreme cold, and enuresis, one should warm the Kidney and disperse cold. If there is manic talking, fixed staring, and enuresis, this indicates the exhaustion of Kidney Qi and is incurable.

The head is the convergence point of all Yang meridians, and the Qi of all Yang channels ascends to the head. If Yang channel Qi is disordered, the head will tremble. There are three types of head tremors: First, shaking the head while speaking indicates an interior pathology; due to internal pain, speaking exacerbates the pain, causing the head to shake when attempting to speak. Second, isolated head tremor, sudden lockjaw, and opisthotonos indicate Jing Disease (Spasm Disorder). This occurs because Wind pathogen is abundant in the upper part; since Wind is characterized by movement, it causes head tremor. Here, "interior pathology" is not caused by external pathogens but by pain; "Jing Disease" is not Jue reversal but caused by Wind. Third, if Yang Qi remains exclusively in the upper part, the body appears dark like smoke, with fixed staring and head tremor, this indicates the exhaustion of Heart Qi.

Fu Yu (Depression/Stagnation) generally arises from exterior pathogens causing fever and sweating. Incomplete covering during sweating prevents thorough perspiration, or wind pathogens obstruct the surface, causing Yang Qi to stagnate in the skin and muscles, steaming towards the head and face, where it gathers and fails to dissipate. If facial redness is caused by Yin excess, the complexion is dull and lacks luster. If facial redness is caused by Yang excess, the complexion is bright and moist. Treatment requires careful examination of Deficiency and Excess; one must not treat facial redness simply as Yang Fire based on appearance alone.