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Bengzhong (Sudden Profuse Uterine Bleeding) is caused by damage to the Zang-Fu organs and deficiency of Qi and Blood in the Chong Mai (Penetrating Vessel) and Ren Mai (Conception Vessel). The Chong and Ren meridians are the "Sea of the Twelve Meridians"; the movement of Qi and Blood circulates outward along the collaterals and nourishes the Zang-Fu organs inward. If there is no injury, the Zang-Fu organs remain harmonious, Qi and Blood are balanced, and menstruation occurs on schedule. However, if excessive labor leads to injury of all Zang-Fu organs, causing deficiency of Qi in the Chong and Ren meridians, they lose the ability to restrain and control menstrual blood, resulting in sudden profuse bleeding, which is termed Bengzhong.

Upon palpation, if the Cun Kou pulse is faint and slow, and the Chi pulse is fainter than the Cun pulse, a slow pulse at the Cun position indicates Cold in the Upper Jiao, manifesting only as vomiting. Now, if the Chi pulse is slow and wiry, accompanied by lower abdominal pain and pain in the waist and spine, it is certain that vaginal bleeding will occur.

White Beng (Leukorrhea with Hemorrhage) results from labor-induced injury to the Bao Luo (Uterine Collaterals) and extreme deficiency of Qi. The Lung governs Qi; extreme deficiency of Qi leads to Lung deficiency and Cold. Since the color associated with the Lung organ is white, when combined with turbid fluids between the deficient-cold Lung and the injured Bao Luo due to extreme labor, this mixture discharges suddenly, forming White Beng.

The disease of Bengzhong involves damage to the Chong and Ren meridians, which both originate within the Bao Gong (Uterus) and serve as the Sea of the Twelve Meridians. Excessive labor causes deficiency of Qi in the Chong and Ren meridians, preventing them from governing and controlling menstrual blood, leading to sudden profuse bleeding, known as Bengzhong. The Five Zang organs all receive Qi and Blood; their colors vary according to the specific organ. In cases where injury has led to deficiency in all Five Zang organs, the five colors discharge together with the bleeding. The manifestations are: White Beng resembles mucus; Red Beng resembles red fluid; Yellow Beng resembles juice from rotting melon; Green Beng resembles blue color; Black Beng resembles dried blood clots.

The disease of Bengzhong involves damage to the Chong and Ren meridians, which both originate within the Bao Gong (Uterus) and serve as the Sea of the Twelve Meridians. Excessive labor causes deficiency of Qi in the Chong and Ren meridians, preventing them from restraining menstrual blood, leading to sudden profuse bleeding, known as Bengzhong. When stasis of Blood exists internally during the hemorrhage, the bleeding stops and starts intermittently, dripping continuously, a condition named Bengzhong Louxia (Bengzhong with Dripping Leakage).

The disease of Bengzhong involves labor-induced injury to the Chong and Ren meridians, which originate within the Bao Gong (Uterus) and serve as the Sea of the Twelve Meridians. Excessive labor causes deficiency of Qi in the Chong and Ren meridians, preventing them from governing menstrual blood, leading to sudden profuse bleeding, known as Bengzhong. With internal stasis of Blood, the discharge continues dripping, termed Louxia (Dripping Leakage). If Louxia persists without stopping, it damages the Five Zang organs. Due to deficiency, the colors of the Five Zang organs discharge mixed with blood. The manifestations are: white like mucus, red like red fluid, yellow like rotting melon juice, green like blue, black like dried blood clots, all mixing together and discharging downward.