Inguinal hernia is a common and frequent disease. At present, tension-free hernia repair has become a routine treatment for inguinal hernia, which has the advantages of minimal surgical trauma, rapid postoperative recovery, and low recurrence rate. While the recurrence rate can be satisfactorily controlled by tension-free hernia repair, the improvement of patients’ quality of life after surgery is also an important evaluation index of hernia repair. The concept of chronic postoperative pain after inguinal hernia surgery has been increasingly appreciated by clinicians. Chronic pain after tension-free hernia repair is defined as pain that persists for more than 3 months after hernia repair and extends beyond the surgically involved area, generally manifested by the presence of persistent or intermittent dull, sharp, or burning pain in the inguinal region of the ilium, and/or the inner thigh, and/or the perineum, and is a more common complication after this procedure. Our department admitted 48 patients with postoperative pain after inguinal hernia surgery from 2004 to 2012, and we report the following. 1. Clinical data (1) General data: All cases in this group were, 47 male and 1 female, with a male to female ratio of 47:1; age 33-82 years, mean age 52 years. There were 40 cases of hiatal hernia and 8 cases of straight hernia. There were 46 cases of unilateral hernia and 2 cases of bilateral hernia. There were 5 cases of recurrent hernia. (2) Clinical manifestations: 30 cases had pain for 12 weeks, 14 cases had pain lasting 3-6 months, and another 4 cases had repeated pain lasting more than 6 months. The pain was sometimes very severe and unbearable, which obviously affected daily work and life. Except for inflammatory changes such as redness and swelling in the incision area and elevated skin temperature. (3) Ultrasound examination: All cases were examined by ultrasound, which indicated that there was no obvious displacement of the patch and no liquid dark area or abnormal nodules under the skin of the affected area. 2.Treatment method All cases in this group were treated with self-prepared traditional Chinese medicine formula with external application and semiconductor laser irradiation. Each treatment course is 14 days. (1) Externally applied formula: Chuanxiong 50g, Yanhuosuo 50g, Panax notoginseng 50g, Boswellia 50g, Myrrh 50g, Blood and Soul 50g, Scabious 50g, Neem 50g and then put them into a cloth bag. (2) SUNDOM-3001B semiconductor laser was used. (2) Use SUNDOM-3001B semiconductor laser to irradiate the affected area, each treatment time is 10min, 2 times a day. (1) Efficacy criteria: Cure: clinical symptoms completely disappeared, normal working life, no recurrence after 3 months of drug withdrawal. Effective: clinical symptoms improved significantly, working life is basically normal, pain interference is not obvious. Ineffective: no improvement of clinical symptoms after treatment. (2) Treatment results: 38 cases were cured, 8 cases improved and 2 cases invalid among 48 cases, with a total efficiency of 95.2%. 3 cases had local allergy and mild itching of the skin, but the treatment was not affected by side effects. 4. Discussion According to Western medicine, inguinal hernia repair surgery increases the chance of pulling, separating, clamping and improper suturing of nerves during surgery, leading to chronic postoperative pain. Effective intraoperative anesthesia, careful manipulation, avoidance of blunt dissection, proper hemostasis, and nerve protection may reduce the incidence and severity of chronic postoperative pain. Currently in clinical treatment, the commonly used local closed injection therapy can only temporarily relieve the symptoms, and the efficacy of surgical methods such as nerve bundle dissection is inexact, and there is no treatment method with good and lasting effect. According to Chinese medicine, the disease is caused by the damage to the meridians and tendons during surgery, the blood vessels are damaged, the blood leaves the meridians and stays in the body, or the local blood does not run smoothly, thus forming blood stasis. The “Shuowen Jiezi” says: “Stasis is also the accumulation of blood.” Blood stasis refers to the stagnation of blood in the body and its inability to circulate properly. It includes both the blood that accumulates in the body away from the meridian and the blood that is blocked in the blood vessels and internal organs and does not run properly. Blood is the mother of gas, one is the blood can be angry, gas in the blood, blood constantly for the generation of gas and functional activities to provide water and grain essence, so the blood is prosperous gas, blood failure is less gas. Second, blood can carry gas, gas in the blood, rely on the blood to carry and reach the whole body, blood does not carry gas, the gas has no place to return, resulting in gas stagnation. If the blood does not carry qi, the qi has no place to return to, resulting in qi stagnation and blood stasis, the local qi is blocked and painful. Therefore, the key to the treatment of this disease is to activate blood circulation, remove blood stasis, move Qi and relieve pain. In this formula, Chuanxiong, Panax notoginseng, Boswellia, Myrrh, and Blood-sucking are used to invigorate blood circulation and remove stasis, while Xiangxiang, Chuanhuzi, and Yanhuosuo are used to move Qi and relieve pain. At the same time, through the physical effect of the heat pack, the local blood circulation is promoted, and the sterile inflammatory mediators or painful chemical mediators produced by the local soft tissue after surgery are carried away by accelerating blood circulation to achieve the effect of reducing pain. The principle of semiconductor laser treatment is to affect a series of neurotransmitter changes through the biostimulation effect of laser, so that the tissue releases endogenous analgesic substances and reduces the amount of local 5-hydroxytryptamine synthesis, while its weak light can reduce the permeability of the vascular wall and reduce the exudation of inflammation, with tissue repair and bioregulatory functions.