Shortwave Intervention for Diabetic Peripheral Neuropathy.

Inclusion Criteria: * 1\. Aged 18-85 years, regardless of gender, with the ability to act independently; * 2\. Appearance of neuropathic symptoms or signs at the time of or after the diagnosis of diabetes, meeting the following criteria: presence of DPN symptoms (numbness, tingling, burning, cold, pain), with or without signs (abnormalities in any of ankle reflex, vibration sense, pinprick sensation, temperature sensation, or pressure sensation); * 3\. Able to complete the TCSS assessment; * 4\. Understands the entire trial process, voluntarily participates in the study, and signs the informed consent form. * 5\. Patients who did not respond to adequate treatment with mecobalamin and other medications. Exclusion Criteria: * 1\. Peripheral neuropathy caused by other reasons (such as lumbar spine lesions, vitamin B12 deficiency, uncontrolled hypothyroidism, alcohol intoxication, drug neurotoxicity, Guillain-Barré syndrome, etc.); * 2\. Hemorrhagic diseases, malignant tumors; * 3\. History of below-knee amputation; * 4\. Skin damage, infection at the treatment site, or presence of metal implants, pacemaker; * 5\. Combined severe heart, liver, or kidney dysfunction (e.g., eGFR \< 15 ml/min/1.73m²), or cognitive impairment preventing cooperation; * 6\. Pregnancy, breastfeeding, or planning pregnancy; * 7\. Participation in other interventional clinical trials within the past 3 months; * 8\. Combined severe psychiatric disorders; * 9\. Other conditions assessed by the investigator that prevent completion of the trial; * 10\. Poor compliance.