Its position circling the lower torso puts the Girdle Vessel in close functional relationship with the same reproductive anatomy the Penetrating and Conception Vessels are tied to, and Chinese gynecological practice has traditionally attributed some vaginal discharge complaints and other lower-abdominal gynecological disorders to disturbance of this vessel specifically, distinct from the menstrual disorders more often attributed to the Penetrating Vessel.
Because the Girdle Vessel binds rather than transports in the way the vertical channels do, its therapeutic use in acupuncture tends to focus on restoring coordination, cases where the upper and lower body seem to be working against rather than with each other, a category of complaint that does not map neatly onto any single regular channel's territory.
The naming shows how tight the association is. Classical Chinese medicine calls the discharge disorders daixia, literally below the belt, and the same term came to stand for the whole field of women's medicine, so that a physician described as a daixia doctor was a gynaecologist. The band this vessel describes is the line the term is measured from.
That is also why the Girdle Vessel is grouped with the Penetrating and Conception Vessels in gynaecological practice rather than treated on its own: all three are placed in the lower abdomen in classical description, and a practitioner working from that model reads a lower-abdominal complaint by asking which of the three the presentation fits, rather than whether an extraordinary vessel is involved at all.