Si Ni San (Frigid Extremities Powder) — Herbal Remedy for Yang constraint (qi stagnation) with cold extremities: cold fingers and toes but warm body, chest and hypochondriac fullness, abdominal pain, irritability. Modern: liver qi stagnation, stress-related symptoms, intercostal neuralgia, functional abdominal pain | Living Netism

Despite its name suggesting cold (frigid extremities), Si Ni San actually treats cold fingers and toes caused by liver qi stagnation preventing yang qi from reaching the extremities (yang constraint,