Type 1 Diabetes Mellitus (DM) is one of the most common diseases in childhood. It has a multifactorial etiology depending on genetic, autoimmune and environmental causes. Type 1 DM may present with many different symptoms during diagnosis.  The most severe of these symptoms is undoubtedly diabetic ketoacidosis (DKA). The incidence of Type 1 DM is increasing day by day and the incidence of Type 1 DM under the age of 18 in Turkey has been reported as 10.8/100.000 and prevalence as 0.75/1000. Type 1 DM may present with symptoms such as polydipsia, polyuria, polyphagia and inability to gain weight despite polyphagia, anorexia, weakness, fatigue, nocturia, dry mouth, unexplained weight loss, and recurrent infections.

Family Medicine is one of the departments where the most undifferentiated patients are encountered among the medical disciplines. In this case report, we aimed to discuss a case involving the diagnosis of Type 1 DM after a patient who came to primary care with the complaint of vomiting was referred with the suspicion of Diabetic Ketoacidosis and to emphasize the importance of undifferentiated patient approach in primary care.