High blood sugar (hyperglycaemia) is where the level of sugar in your blood is too high. It mainly affects people with diabetes and can be serious if not treated. Show
People with diabetes can also have blood sugar that's too low. This is called low blood sugar (hypoglycaemia). High blood sugar levelsIf you have diabetes, you can find out if your blood sugar level is high by having a blood sugar (blood glucose) test. You may have regular tests by your care team or GP surgery, or you may have tests you can do at home. Types of diabetes test and high blood sugar levels.Type of testHigh levelTest done by a health professional to check your blood sugar level over the last 2 or 3 months (HbA1c test)48 mmol/mol or over (6.5% if you're given a percentage)Test done by a health professional after not eating for a few hours (fasting glucose test)Over 7 mmol/LHome test done after waking up or before eatingOver 7 mmol/LHome test done at any other timeOver 11 mmol/L Important: ImportantThese blood sugar levels are a guide. Your levels may be different depending on your age and the type of diabetes you have. Check with your doctor or care team. Symptoms of high blood sugarSymptoms of high blood sugar usually come on gradually and may only start when your blood sugar level gets very high. Common symptoms include:
Causes of high blood sugarCommon causes of high blood sugar in people with diabetes include:
You can also get high blood sugar if your diabetes medicine is not working well, you're taking certain medicines (such as steroids) or you recently had an operation. How to lower your blood sugarIf you have diabetes, it's important to try to stop your blood sugar level getting too high. Do
Don’t
Non-urgent advice: Speak to your care team or GP surgery if:
Problems caused by high blood sugarIt's not usually a serious problem if your blood sugar is sometimes slightly high for a short time. But high blood sugar can cause serious problems if it stays high for a long time or gets to a very high level. It can lead to:
If you have high blood sugar, your doctor or care team may ask you to test your blood or pee to check for ketones. A high level of ketones is a sign of diabetic ketoacidosis. A diabetic coma is a life-threatening disorder that causes unconsciousness. If you have diabetes, dangerously high blood sugar (hyperglycemia) or dangerously low blood sugar (hypoglycemia) can lead to a diabetic coma. If you go into a diabetic coma, you're alive — but you can't wake up or respond purposefully to sights, sounds or other types of stimulation. If it's not treated, a diabetic coma can result in death. The idea of a diabetic coma can be scary, but you can take steps to help prevent it. One of the most important is to follow your diabetes treatment plan. Products & Services
SymptomsSymptoms of high blood sugar or low blood sugar usually develop before a diabetic coma. High blood sugar (hyperglycemia)If your blood sugar level is too high, you may have:
Low blood sugar (hypoglycemia)If your blood sugar is too low, you may have:
Some people, especially those who've had diabetes for a long time, develop a condition known as hypoglycemia unawareness. That means they don't have warning symptoms that signal a drop in blood sugar. If you have any symptoms of high or low blood sugar, test your blood sugar right away. Based on the test results, follow your diabetes treatment. If you don't start to feel better quickly, or you start to feel worse, get medical care right away. When to see a doctorA diabetic coma is a medical emergency. If you have symptoms of high or low blood sugar and you think you might pass out, call 911 or your local emergency number. If you're with someone with diabetes who has passed out, call for emergency help. Tell the emergency personnel that the unconscious person has diabetes. Request an Appointment at Mayo Clinic There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. Sign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health. Email ErrorEmail field is required ErrorInclude a valid email address To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. |
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