Proteasome inhibitors (PIs), especially bortezomib (BTZ), have come to the forefront over the last years because of their unprecedented efficacy mainly against multiple myeloma (MM). Unfortunately, peripheral neuropathy (PN) secondary to treatment of MM with PIs has emerged as a clinically relevant complication, which negatively impacts the quality of life of MM survivors. Bortezomib-induced peripheral neuropathy (BIPN) is a dose-limiting toxicity, which develops in 30% to 60% of patients during treatment. Typically, BIPN is a length-dependent sensory axonopathy characterized by numbness, tingling, and severe neuropathic pain in stocking and glove distribution. BIPN mechanisms have not yet been fully elucidated. Experimental studies suggest that aggresome formation, endoplasmic reticulum stress, myotoxicity, microtubule stabilization, inflammatory response, and DNA damage could contribute to this neurotoxicity. A new generation of structurally distinct PIs has been developed, being increasingly used in clinical settings. Carfilzomib exhibits a much lower neurotoxicity profile, with a significantly lower incidence of PN compared to BTZ. Pre-existing PN increases the risk of developing BIPN. Besides, BIPN is related to dose, schedule and mode of administration and modifications of these factors have lowered the incidence of PN. However, to date there is no cure for PIs-induced PN (PIIPN), and a careful neurological monitoring and dose adjustment is a key strategy for preserving quality of life. This review critically looks at the pathogenesis, incidence, risk factors, both clinical and pharmacogenetics, clinical phenotype and management of PIIPN. We also make recommendations for further elucidating the whole clinical spectrum of PIIPN. K E Y W O R D S bortezomib, carfilzomib, peripheral neuropathy, peripheral neurotoxicity, proteasome inhibitor-induced neuropathy 1 | INTRODUCTION Inhibition of proteasome function has emerged as an efficacious strategy with a robust rationale in anticancer therapy. Proteasome inhibitor (PI)-based regimens have become an integral component of the treatment of multiple myeloma (MM), a malignancy of plasma cells accounting for approximately 1% of cancers and 12% of hematological malignancies. Bortezomib (BTZ) was the first approved PI and to date has become the standard of anti-myeloma 1 and mantle cell lymphoma therapies. 2 Postmarketing trials of BTZ quickly pointed to PN as its main nonhematological, dose-limiting toxicity of BTZ. Similar to clinical trial results, the use of BTZ in real-world oncology practice documented that BTZ-induced peripheral neuropathy (BIPN) develops in up to 50% of BTZ-treated MM patients. 3,4 PN due to MM treatment