As stated in the Nei-Ging, cancer pain comes mainly from weakness of the spirit and malfunction of the internal organs, which contribute to poisoning the body and stagnating the flow of air and blood.

• 而黄帝内经论及对癌症疼痛的病机主为正气虚弱、脏腑功能失调、导致邪毒内蓄、气机郁滞、脉络瘀阻，致“不通则痛”；