In the structure of the human body, below the left side of the navel are the organs of the digestive system, the organs of the urinary system, the male reproductive organs, and the accessories of the female reproductive system. Below the left side of the navel according to the abdominal tetrad for the lower left abdominal region, in this area there is the sigmoid colon, rectum, bladder, left ureter, men also have the left side of the vas deferens, and women have the left side of the ovary, the left side of the fallopian tube and other organs. For the navel left under the region of the discomfort of the crowd, generally consider the above mentioned organ lesions, but does not exclude the metastasis of other lesions, such as cancer metastasis, etc., so the discomfort of the crowd of the said part, it is recommended that timely access to regular hospitals, after a series of tests, by a professional doctor to clarify the cause of the disease, and then formulate the next step of the treatment program.