I read in the book Tongue Diagnosis in Chinese Medicine by Giovanni Maciocia on page 61 that a bluish purple root signifies cold and blood stasis in the lower burner, preceded by Spleen and Kidney Yang deficiency leading to more serious development of internal cold and thereby obstruction of blood movement leading to blood stasis. The symptoms include chills, coldness in limbs, edema, impotence, abdominal pain, low back pain, deep firm pulse. Why does cold and blood stasis also lead to watery stool and clear, copious urine? There are some basics that I must have missed, as I remember in my beginning level, I was simply told, cold equals yin and water… but no more clarification, and I can’t make the connection between cold and stasis with this diagnosis. How can you explain watery waste excretion in the context of yang deficiency with cold and blood stasis? Thank you.