Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system (CNS). It usually affects young adults and can have dramatic consequences on the functional, emotional and financial course of the patient's life. Comorbidities are common in MS patients. This combination of pathologies causes a decrease in quality of life and long-term disability, further worsening the prognosis of MS.We carried out a retrospective study of the files of 137 patients followed for MS, all forms combined, in specialized consultation at the Neurology department of the University Hospital Mustapha Pasha, during the period between the year 2000 and 2018.The results obtained show that certain comorbidities are more frequent in patients with multiple sclerosis, such as autoimmune pathologies, with a clear predominance of dysthyroidism (19.5%), hypertension and cardiovascular disorders (12.03%). ), ophthalmic diseases (9.77%), psychiatric disorders (depression, anxiety, psychosis, etc.) (7.5%) and epilepsy (5.26%).Several parameters can be affected in the event of association of one or more comorbidities such as diagnostic latency, clinical presentation of MS, acceleration of disability progression, increased mortality and reduced quality of life.Comorbidities complicate the management of patients with multiple sclerosis and have a real impact on their health as well as on the social and economic aspects of their lives. Consequently, a multidisciplinary approach to this pathology and better monitoring remain mandatory.