High Blood Sugar (Hyperglycemia)
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Try one of these related symptoms.
High blood sugar levels
Blood glucose high
Uncontrolled diabetes
Blood glucose high for a long time
Constantly thirsty
Excessive urination especially at night
Injuries taking longer to heal
Family history of diabetes
About the Symptom
High blood sugar (hyperglycemia) occurs when blood glucose levels are above normal range, typically above 180-200 mg/dL. It's commonly associated with diabetes and can lead to serious complications if left untreated.
When to See a Doctor
Seek professional care if you experience any of the following symptoms
- Extreme thirst
- Frequent urination
- Blurred vision
- Fatigue and weakness
- Confusion or difficulty concentrating
- Fruity-smelling breath
- Nausea and vomiting
- Shortness of breath
- Dry mouth
- Loss of consciousness
- Very high blood sugar readings (over 250 mg/dL)
- Rapid heartbeat
- Excessive sweating
Reviewed By:
Kenji Taylor, MD, MSc (Family Medicine, Primary Care)
Dr. Taylor is a Japanese-African American physician who grew up and was educated in the United States but spent a considerable amount of time in Japan as a college student, working professional and now father of three. After graduating from Brown, he worked in finance first before attending medical school at Penn. He then completed a fellowship with the Centers for Disease Control before going on to specialize in Family and Community Medicine at the University of California, San Francisco (UCSF) where he was also a chief resident. After a faculty position at Stanford, he moved with his family to Japan where he continues to see families on a military base outside of Tokyo, teach Japanese residents and serve remotely as a medical director for Roots Community Health Center. He also enjoys editing and writing podcast summaries for Hippo Education.
Yoshinori Abe, MD (Internal Medicine)
Dr. Abe graduated from The University of Tokyo School of Medicine in 2015. He completed his residency at the Tokyo Metropolitan Health and Longevity Medical Center. He co-founded Ubie, Inc. in May 2017, where he currently serves as CEO & product owner at Ubie. Since December 2019, he has been a member of the Special Committee for Activation of Research in Emergency AI of the Japanese Association for Acute Medicine. | | Dr. Abe has been elected in the 2020 Forbes 30 Under 30 Asia Healthcare & Science category.
Content updated on Mar 26, 2025
Following the Medical Content Editorial Policy
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Link to full study:
https://www.medrxiv.org/content/10.1101/2024.08.29.24312810v1References
Mouri MI, Badireddy M. Hyperglycemia. [Updated 2023 Apr 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-.
https://www.ncbi.nlm.nih.gov/books/NBK430900/Guillermo E. Umpierrez, Georgia M. Davis, Nuha A. ElSayed, Gian Paolo Fadini, Rodolfo J. Galindo, Irl B. Hirsch, David C. Klonoff, Rozalina G. McCoy, Shivani Misra, Robert A. Gabbay, Raveendhara R. Bannuru, Ketan K. Dhatariya; Hyperglycemic Crises in Adults With Diabetes: A Consensus Report. Diabetes Care 25 July 2024; 47 (8): 1257–1275.
https://diabetesjournals.org/care/article/47/8/1257/156808/Hyperglycemic-Crises-in-Adults-With-Diabetes-ADavies MJ, D'Alessio DA, Fradkin J, Kernan WN, Mathieu C, Mingrone G, Rossing P, Tsapas A, Wexler DJ, Buse JB. Management of Hyperglycemia in Type 2 Diabetes, 2018. A Consensus Report by the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD). Diabetes Care. 2018 Dec;41(12):2669-2701. doi: 10.2337/dci18-0033. Epub 2018 Oct 4. PMID: 30291106; PMCID: PMC6245208.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6245208/