Behcet's syndrome is an autoimmune disease of the seronegative vasculitic type, with a disease of vessels of variable caliber. It is mainly characterized by oral ulcers, genital ulcers and uveitis. The purpose of this case is to describe the oral manifestations and therapeutic behavior to be followed before a patient with Behcet syndrome. For our purpose, the case of a 20-year-old patient, female, black race, urban origin, who goes to the emergency departments of Maxillofacial Surgery of the body of guard of the Provincial Hospital Dr. Gustavo Aldereguía Lima in the province of Cienfuegos, referred by the specialist in Comprehensive General Stomatology who provided services in the area of health corresponding to the patient for presenting multiple ulcerated lesions throughout the oral cavity and lips. It was concluded that oral ulcers in Behcet's disease are the first clinical manifestation, which in most cases, lead the patient to seek medical help and are considered by countless authors as the cornerstone to reach the diagnosis of this disease. A total of 14 bibliographies were consulted.