Background: Although inadequately studied in psoriasis patients, brain-derived neurotrophicfactor (BDNF) has been demonstrated to have a critical role in the development of variousautoimmune illnesses.Objectives: examining the relevance of serum levels of brain-derivedneurotrophic factor in psoriasis patients compared to healthy controls and determining howthese levels relate to cognitive abilities.Data Sources: By going through and examining theMedline databases (Pub Med and Medscape) for papers published up until 2022 that lookedat the potential function of brain-derived neurotrophic factor in people with psoriasis.StudySelection: The following inclusion criteria were independently evaluated for compliance ineach study: 1. Written in English and published in English. 2. Printed in journals with peer
review. 3. Describe how serum concentration varies. Brain Derived Neurotrophic Factor maybe related to psoriasis vulgaris, and psoriasis sufferers may have cognitive impairment as aresult. . Data Extraction: The following criteria were used to evaluate the quality of the study:
eligibility criteria that were clearly stated, acceptable controls, sufficient information and well
defined evaluation methods. To gather information on the research results we wereinterested in, data from each eligible study were separately abstracted using a data collectingform.Conclusion: Patients with psoriasis vulgaris have reduced serum BDNF levels, whichisoften accompanied with cognitive decline