Symptoms of Type 1 Diabetes

Symptoms of type 1 diabetes are caused by the buildup of glucose in the blood where it cannot be used by cells for energy. Problems may be:
  • Urinating often
  • Being very thirsty or hungry
  • Feeling very tired and weak
  • Blurry vision
  • Losing weight without trying
  • Belly pain
Severe symptoms can lead to diabetic ketoacidosis. This is when glucose levels rise and the body starts to break down fat to use as energy instead. This makes a by-product called ketone bodies. They are made up of acids that can build up in the body and cause these additional type 1 diabetes symptoms:
  • Problems breathing
  • Belly pain
  • Nausea and vomiting
  • Headache
  • Confusion
  • Fruity breath odor
  • Dry skin and mouth
This problem can be deadly and must be treated right away.


American Diabetes Association. Standards of medical care in diabetes-2019. Diabetes Care. 2019. Jan; 42 (Suppl 1):S1-193.
Diabetes mellitus type 1. EBSCO DynaMed website. Available at:  . Updated June 28, 2019. Accessed November 22, 2019.
Diabetic ketoacidosis (DKA) in adults. EBSCO DynaMed website. Available at: . Updated August 23, 2017. Accessed December 12, 2019.
Type 1 diabetes. American Diabetes Association website. Available at: Accessed November 22, 2019.

Revision Information

  • Reviewer: EBSCO Medical Review Board James P. Cornell, MD
  • Review Date: 09/2019
  • Update Date: 12/12/2019