Background: Hair loss is a very common complaint. Patients may describe increased shedding and diffuse or localized alopecia. The differential diagnosis of hair loss includes a number of disorders causing cicatricial or noncicatricial alopecias.
Objectives: This study aimed to determine the most common causes of hair loss among patients who attended hair clinic at Sohag university hospital.
patients and methods: This study included 100 patients who attended the hair clinic, dermatology department at Sohag University Hospital between June 2018 to October 2018. The data entry was done by using Microsoft Excel, while the analysis was done by using SPSS version 23.
Results: In this study we found that androgenetic alopecia was the most common cause of hair loss in our studied population(45%)   followed by in descending manner alopecia areata (26%), telogen effluvium (14), tractional alopecia (7%), lichen planopilaris (5%) and trichotillomania (3%).  
Conclusion: Androgenetic alopecia is the most common cause of hair loss among patients who attended the hair clinic at Sohag university hospital.