The participants will be guided by a research staff to do the Ba-Duan-Jin therapy for 50 minutes twice weekly for 12 weeks, in the outpatient section of the hospital; Pregabalin placebo treatment will be administered at bedtime once a day, starting at 150 mg for the first week, and increase to the dose of 300 mg from the second week. After one week, if 300 mg dose is tolerable, then maintain it for 10 additional weeks, if not, then go back to the 150 mg dose for 10 additional weeks.

Wellness education and muscle relaxation exercise program: This program will be held for 50 minutes twice weekly for twelve weeks, containing 10-minute wellness education, 10-minute doctor-patient discussion, and 30-minute guided muscle relaxation exercise.

Active pregabalin capsules: As same usage as the placebo pregabalin capsules.

Ba-Duan-Jin is a common form of "self-healthcare" Qigong exercise that has been practiced by Chinese people for at least eight hundred years.It consists of eight sets of simple movements. By combining meditation with slow, graceful movements,deep breathing, and relaxation, Ba-Duan-Jin practitioners believe it has the ability to move vital energy (Qi) throughout the body. Ba-Duan-Jin is also considered to be a multicomponent intervention that integrates physical, psychosocial, emotional, spiritual, and behavioral elements. While the biological mechanisms remain unclear.

Pain VAS, range from 0 to 100 mm with higher score indicating more severe pain.

Fecal samples are obtained from the experimental group and control group. After extracting DNA from fecal samoles, high-throughput Illumina sequencing, gene classification, abundance calculation, functional and metabolic annotation will be performed on the extracted DNA. The Bowtie2, BWA and Soap2 will be selected for the comparison software. The condition of comparison is to obtain the comparison results of 95% identity (and above).