Background and Objective: Painful diabetic peripheral neuropathy (DPN) affects approximately 6-34% of all patients with diabetes. DPN-induced pain reduces the quality of life and makes daily activities difficult. Distal symmetric polyneuropathy (DSPN) is the most common type of DPN. Here we review the pathophysiology, diagnosis, and treatment of DPN.Methods: A MEDLINE database (PubMed) search was conducted for English-language articles dealing with the effect of DPN that were published until April 1, 2022. To identify potentially relevant articles, the following key search phrases were combined: 'diabetes mellitus', 'diabetes', 'neuropathy', 'polyneuropathy', 'diabetic neuropathies', 'peripheral neuropathy', 'diabetic polyneuropathy', 'pathophysiology', 'diagnosis', and 'treatment'.