1. Factors Influencing Pain Expression in Patients with Cancer: An Expert Opinion

   • Sebastiano Mercadante
   • Flaminia Coluzzi

   Commentary Open access 20 May 2021 Pages: 765 - 775

2. Cluster Headache is Still Lurking in the Shadows

   • Paolo Martelletti
   • Martina Curto

   Commentary Open access 06 June 2021 Pages: 777 - 781

3. Management of Osteoarthritis: Expert Opinion on NSAIDs

   • Alberto Magni
   • Piergiuseppe Agostoni
   • Diego Fornasari

   Review Open access 19 April 2021 Pages: 783 - 808

   

4. Real-World Evidence for Control of Chronic Migraine Patients Receiving CGRP Monoclonal Antibody Therapy Added to OnabotulinumtoxinA: A Retrospective Chart Review

   • Andrew M. Blumenfeld
   • Benjamin M. Frishberg
   • Aubrey Manack Adams

   Review Open access 21 April 2021 Pages: 809 - 826

   

5. The Role of Nutrient Supplementation in the Management of Chronic Pain in Fibromyalgia: A Narrative Review

   • Hannah Waleed Haddad
   • Nikita Reddy Mallepalli
   • Alan David Kaye

   Review Open access 28 April 2021 Pages: 827 - 848

6. Pain Relief and Safety Outcomes with Cervical 10 kHz Spinal Cord Stimulation: Systematic Literature Review and Meta-analysis

   • Ganesan Baranidharan
   • Beatrice Bretherton
   • Anand Rotte

   Review Open access 25 May 2021 Pages: 849 - 874

   

7. Complex Regional Pain Syndrome: A Comprehensive Review

   • Samantha-Su Taylor
   • Nazir Noor
   • Omar Viswanath

   Review Open access 24 June 2021 Pages: 875 - 892

8. Correction to: Complex Regional Pain Syndrome: A Comprehensive Review

   • Samantha-Su Taylor
   • Nazir Noor
   • Omar Viswanath

   Correction Open access 26 July 2021 Pages: 893 - 894

9. Spinal Cord Stimulation for Painful Diabetic Peripheral Neuropathy: A Systematic Review

   • Josianna V. Henson
   • Narayana C. Varhabhatla
   • Justin S. Merkow

   Review Open access 10 July 2021 Pages: 895 - 908

   

10. The Routes of Administration for Acute Postoperative Pain Medication

    • Filomena Puntillo
    • Mariateresa Giglio
    • Giustino Varrassi

    Review Open access 17 July 2021 Pages: 909 - 925

11. Microglia in the Pathophysiology of Hemorrhagic Stroke and the Relationship Between Microglia and Pain After Stroke: A Narrative Review

    • Chen He
    • Renhuai Liu
    • Binxiao Su

    Review Open access 18 July 2021 Pages: 927 - 939

    

12. Decompression Using Minimally Invasive Surgery for Lumbar Spinal Stenosis Associated with Degenerative Spondylolisthesis: A Review

    • Jun Zhang
    • Tang-Fen Liu
    • Hai-Qiang Wang

    Review Open access 28 July 2021 Pages: 941 - 959

    

13. Peripheral Nerve Stimulation: A Review of Techniques and Clinical Efficacy

    • Alan D. Kaye
    • Sasha Ridgell
    • Richard D. Urman

    Review Open access 31 July 2021 Pages: 961 - 972

14. Musculoskeletal Pain Due to Wheelchair Use: A Systematic Review and Meta-Analysis

    • Andreas Liampas
    • Panayiota Neophytou
    • Panagiotis Zis

    Review Open access 13 August 2021 Pages: 973 - 984

    

15. Peripheral Nerve Stimulation for Chronic Pain: A Systematic Review of Effectiveness and Safety

    • Standiford Helm
    • Nikita Shirsat
    • Andrea Trescot

    Review Open access 03 September 2021 Pages: 985 - 1002

16. Pharmacological Advances in Opioid Therapy: A Review of the Role of Oliceridine in Pain Management

    • Alan D. Kaye
    • Amber N. Edinoff
    • Richard D. Urman

    Review Open access 04 September 2021 Pages: 1003 - 1012

17. Status of N-of-1 Trials in Chronic Pain Management: A Narrative Review

    • Wanying He
    • Zichan Cui
    • Fengxian Li

    Review Open access 16 September 2021 Pages: 1013 - 1028

    

18. Historical Review of Studies on Sacroiliac Fatty Nodules (Recently Termed “Back Mice”) as a Potential Cause of Low Back Pain

    • Marta Cañis Parera
    • Marta Expósito Izquierdo
    • Juan Jose Cabré Vila

    Review Open access 16 September 2021 Pages: 1029 - 1050

    

19. The Role of Serratus Anterior Plane Block During in Video-Assisted Thoracoscopic Surgery

    • Jia-qi Chen
    • Xin-lu Yang
    • Di Wang

    Review Open access 19 September 2021 Pages: 1051 - 1066

    

20. Machine Learning in Pain Medicine: An Up-To-Date Systematic Review

    • Maria Matsangidou
    • Andreas Liampas
    • Panagiotis Zis

    Review Open access 26 September 2021 Pages: 1067 - 1084

    

21. Analgesic Effects of Navigated Repetitive Transcranial Magnetic Stimulation in Patients With Acute Central Poststroke Pain

    • Chen-Guang Zhao
    • Wei Sun
    • Hua Yuan

    Original Research Open access 17 April 2021 Pages: 1085 - 1100

    

22. Correction to: Analgesic Effects of Navigated Repetitive Transcranial Magnetic Stimulation in Patients With Acute Central Poststroke Pain

    • Chen-Guang Zhao
    • Wei Sun
    • Hua Yuan

    Correction Open access 21 May 2021 Pages: 1101 - 1103

    

23. Acute Pain Predictors of Remote Postoperative Pain Resolution After Hand Surgery

    • Jennifer M. Hah
    • Chinwe A. Nwaneshiudu
    • Catherine M. Curtin

    Original Research Open access 18 April 2021 Pages: 1105 - 1119

    

24. Phenotype of Cluster Headache: Clinical Variability, Persisting Pain Between Attacks, and Comorbidities—An Observational Cohort Study in 825 Patients

    • Carl H. Göbel
    • Sarah Karstedt
    • Hartmut Göbel

    Original Research Open access 04 May 2021 Pages: 1121 - 1137

    

25. Impact and Consequences of Opioid-Induced Constipation: A Survey of Patients

    • Giustino Varrassi
    • Vivek Banerji
    • Carmine Pinto

    Original Research Open access 03 June 2021 Pages: 1139 - 1153

    

26. Preemptive Intravenous Nalbuphine for the Treatment of Post-Operative Visceral Pain: A Multicenter, Double-Blind, Placebo-Controlled, Randomized Clinical Trial

    • Xiaofen Liu
    • Jun Hu
    • The study group

    Original Research Open access 04 June 2021 Pages: 1155 - 1169

    

27. The Italian Questionnaire for Cancer Breakthrough Pain Diagnosis, a Multicenter Validation Study

    • Boaz Gedaliahu Samolsky Dekel
    • Alberto Gori
    • Rita Maria Melotti

    Original Research Open access 06 June 2021 Pages: 1171 - 1188

    

28. A Comparison of 1000 Hz to 30 Hz Spinal Cord Stimulation Strategies in Patients with Unilateral Neuropathic Leg Pain Due to Failed Back Surgery Syndrome: A Multicenter, Randomized, Double-Blinded, Crossover Clinical Study (HALO)

    • Jennifer Breel
    • Frank Wille
    • Markus W. Hollmann

    Original Research Open access 06 June 2021 Pages: 1189 - 1202

    

29. Effectiveness and Safety of CGRP-mAbs in Menstrual-Related Migraine: A Real-World Experience

    • Marcello Silvestro
    • Ilaria Orologio
    • Antonio Russo

    Original Research Open access 09 June 2021 Pages: 1203 - 1214

    

30. Influences of Gender on Intravenous Nalbuphine Actions After Major Abdominal Surgery: A Multicenter Study

    • Amany E. Ayad
    • Ossama H. Salman
    • Giustino Varrassi

    Original Research Open access 10 June 2021 Pages: 1215 - 1233

    

31. ED50 of Propofol Combined with Nalbuphine on the Sedative Effect in Painless Hysteroscopy

    • Chen Chen
    • Weixiang Tang
    • Yuanhai Li

    Original Research Open access 15 June 2021 Pages: 1235 - 1243

    

32. Remote Electrical Neuromodulation (REN) for the Acute Treatment of Menstrual Migraine: a Retrospective Survey Study of Effectiveness and Tolerability

    • Hida Nierenburg
    • Liron Rabany
    • Linus Chuang

    Original Research Open access 17 June 2021 Pages: 1245 - 1253

    

33. Efficacy and Safety of 10 kHz Spinal Cord Stimulation Using Cervical and Thoracic Leads: A Single-Center Retrospective Experience

    • Gernot Surges
    • Joachim Paulus
    • Anand Rotte

    Original Research Open access 08 July 2021 Pages: 1255 - 1268

    

34. Effects of Temperature and Position Change on Neonatal Brain Regional Oxygen Saturation in Tub Bathing: A Prospective Study

    • Tomohiko Nishino
    • Naoki Ito
    • Masakazu Mimaki

    Original Research Open access 14 July 2021 Pages: 1269 - 1282

    

35. The Effect of Preoperative Anxiety and Pain Sensitivity on Preoperative Hemodynamics, Propofol Consumption, and Postoperative Recovery and Pain in Endoscopic Ultrasonography

    • Ferda Yilmaz Inal
    • Yadigar Yilmaz Camgoz
    • Hasan Kocoglu

    Original Research Open access 22 July 2021 Pages: 1283 - 1293

36. Opioid-Free Recovery After Hernia Repair with HTX-011 as the Foundation of a Non-Opioid, Multimodal Analgesia Regimen in a Real-World Setting: A Randomized, Open-Label Study

    • Harold Minkowitz
    • Roy Soto
    • Jay Redan

    Original Research Open access 27 July 2021 Pages: 1295 - 1308

    

37. Headache Attributed to Vaccination Against COVID-19 (Coronavirus SARS-CoV-2) with the ChAdOx1 nCoV-19 (AZD1222) Vaccine: A Multicenter Observational Cohort Study

    • Carl H. Göbel
    • Axel Heinze
    • Hartmut Göbel

    Original Research Open access 27 July 2021 Pages: 1309 - 1330

    

38. Comparison of Two Ultrasound-guided Plane Blocks for Pain and Postoperative Opioid Requirement in Lumbar Spine Fusion Surgery: A Prospective, Randomized, and Controlled Clinical Trial

    • Lizhen Wang
    • Ying Wu
    • Yuanhai Li

    Original Research Open access 04 August 2021 Pages: 1331 - 1341

    

39. Oliceridine Exhibits Improved Tolerability Compared to Morphine at Equianalgesic Conditions: Exploratory Analysis from Two Phase 3 Randomized Placebo and Active Controlled Trials

    • Gregory B. Hammer
    • Ashish K. Khanna
    • Sabry Ayad

    Original Research Open access 05 August 2021 Pages: 1343 - 1353

    

40. Painful Diabetic Peripheral Neuropathy Study of Chinese Outpatients (PDNSCOPE): A Multicentre Cross-Sectional Registry Study of Clinical Characteristics and Treatment in Mainland China

    • Yuanjin Zhang
    • Shaowei Zhang
    • Dongsheng Fan

    Original Research Open access 07 August 2021 Pages: 1355 - 1373

    

41. Sex-Specific Pharmacotherapy for Back Pain: A Proof-of-Concept Randomized Trial

    • Diane Reckziegel
    • Pascal Tétreault
    • A. Vania Apkarian

    Original Research Open access 10 August 2021 Pages: 1375 - 1400

    

42. Comparison of Vaginal Natural Orifice Transluminal Endoscopic Surgery (vNOTES) and Laparoendoscopic Single-Site (LESS) Hysterectomy on Postoperative Pain Reduction: A Randomized Pilot Study

    • Soo Jin Park
    • Hee Seung Kim
    • Ga Won Yim

    Original Research Open access 10 August 2021 Pages: 1401 - 1411

    

43. Demographics, Pain Characteristics and Diagnostic Classification Profile of Chronic Non-Cancer Pain Patients Attending a Canadian University-Affiliated Community Pain Clinic

    • S. Fatima Lakha
    • Amol Deshpande
    • Angela Mailis

    Original Research Open access 19 August 2021 Pages: 1413 - 1426

    

44. Prevalence and Characteristics of Chronic Pain Among Patients in Portuguese Primary Care Units

    • Filipe Antunes
    • Raul M. Pereira
    • Rita Tinoco

    Original Research Open access 28 August 2021 Pages: 1427 - 1437

    

45. A Prospective Study to Examine the Association of the Foramen Ovale Size with Intraluminal Pressure of Pear-Shaped Balloon in Percutaneous Balloon Compression for Trigeminal Neuralgia

    • Qiao Wang
    • Cheng Chen
    • Haocheng Zhou

    Original Research Open access 30 August 2021 Pages: 1439 - 1450

    

46. Restorative Neurostimulation for Chronic Mechanical Low Back Pain: Results from a Prospective Multi-centre Longitudinal Cohort

    • Simon Thomson
    • Rajiv Chawla
    • The ReActiv8 PMCF Investigators

    Original Research Open access 03 September 2021 Pages: 1451 - 1465

    

47. Assessment of Neuropathic Pain in Ankylosing Spondylitis: Prevalence and Characteristics

    • Ling Zhou
    • Ting Li
    • Huji Xu

    Original Research Open access 04 September 2021 Pages: 1467 - 1479

    

48. Endoscopic Transforaminal Lumbar Foraminotomy: A Systematic Review and Meta-Analysis

    • Enrico Giordan
    • Domenico Billeci
    • Flaminia Coluzzi

    Original Research Open access 06 September 2021 Pages: 1481 - 1495

    

49. Pregabalin and Gabapentin in Patients with Spinal Cord Injury-Related Neuropathic Pain: A Network Meta-Analysis

    • Chen Tong
    • Zuo Zhengyao
    • Mu Fengqun

    Original Research Open access 07 September 2021 Pages: 1497 - 1509

    

50. Clinical Characteristics, Treatment Effectiveness, and Predictors of Response to Pharmacotherapeutic Interventions Among Patients with Herpetic-Related Neuralgia: A Retrospective Analysis

    • Jiehua Zhou
    • Wuping Sun
    • Lizu Xiao

    Original Research Open access 12 September 2021 Pages: 1511 - 1522