2. Hemp seed is a simple drug. It is a dry and moist medicine. Its clinical efficacy is mainly to moisten the intestines and relieve constipation. Clinically, it is mainly used for constipation caused by blood deficiency or blood deficiency and yin deficiency. Of course, its efficacy is relatively simple, and it can also be added to other applications such as Platycladus orientalis leaves, Trichosanthes kirilowii, pine nuts, and Prunus mume kernels. In the case of blood deficiency constipation, it is not like Yangming's viscera, but like rhubarb, which is a combination of dross and heat. Its constipation is mainly manifested as dry stool, such as sheep manure, which is as dry as a ball, and abdominal distension is not obvious. At the same time, it also has other manifestations of yin deficiency and blood deficiency, such as sallow complexion, listless fingernails, less menstrual flow, hair loss, dry skin or easily broken fingernails. Therefore, in the case of syndrome differentiation, if it belongs to blood deficiency constipation, you can choose to smear it.