If the patients often appear leg swelling and pain, there are several reasons as follows: 1, the most common factor is infectious factors, the leg if by bacteria, viruses, fungi, or atypical pathogens such as mycoplasma and chlamydia infections, there will be a large area of subcutaneous cellulitis, and there will also be dengue, this time, the leg will appear swelling and pain of the clinical symptoms. 2, in the leg peripheral neuritis, especially for patients with a history of diabetes, especially prone to peripheral neuritis in the leg, resulting in leg swelling and pain. 3, for example, lumbar spondylosis, cervical spondylosis, sacroiliac arthritis, sciatic neuropathy patients will also have frequent leg distension, accompanied by numbness, pain and discomfort and other clinical symptoms.