Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs Diabetes mellitusUpdated: 2017-06-13OverviewDiabetes mellitus is a group of diseases that result in high blood sugar (glucose). Too much blood sugar can cause serious complications.SymptomsSymptoms may include excessive thirst, frequent urination, extreme hunger, fatigue, and weight loss.TreatmentsTreatments are lifestyle modifications, medications, and insulin, depending on the type of diabetes. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use