Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier
WebMD

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine
WebMD

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion
    WebMD

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community
    WebMD

    Community

    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Diabetes Health Center

Font Size
A
A
A

Type 2 Diabetes - Cause

Causes of diabetes

Type 2 diabetes occurs when your blood sugar (glucose) levels get too high because:

Your weight, how much physical activity you get, and your family history may affect the way your body responds to insulin.

Recommended Related to Diabetes

6 Lifestyle Changes to Help Control Your Diabetes

Working closely with your doctor, you can help manage your diabetes by focusing on six key changes in your daily life. 1. Eat healthy. Eating well is crucial when you have diabetes, because what you eat affects your blood sugar. No foods are strictly off-limits. Focus on eating only as much as your body needs. Eat plenty of vegetables, fruits, and whole grains. Choose nonfat dairy and lean meats. Limit foods that are high in sugar and fat. Remember that carbohydrates turn into sugar, so watch...

Read the 6 Lifestyle Changes to Help Control Your Diabetes article > >

Causes of high blood sugar

High blood sugar can happen if you:

  • Skip a dose of your type 2 diabetes medicine or skip a required dose of insulin.
  • Eat too much.
  • Exercise less than what you are used to doing.
  • Are taking medicines that raise blood sugar as a side effect, such as sleeping pills, some anti-inflammatory medicines (corticosteroids), and some decongestants.
  • Are stressed or ill, especially if you aren't eating or drinking enough. Plan ahead with your doctor and write down sick-day guidelines, which may include testing for ketones.

Being pregnant can also make your blood sugar levels go up.

If you take insulin, you may have some mornings when your blood sugar level is very high, even if it was low when you went to bed. This could be caused by the dawn phenomenon or the Somogyi effect. Talk with your doctor if this happens. You may need to check your blood sugar during the night to find out why your levels are high in the morning.

Causes of low blood sugar

You aren't likely to get low blood sugar unless you take insulin or some kinds of oral medicines that can cause low blood sugar. You may get low blood sugar if you:

  • Take too much diabetes medicine in a day, take your doses too close together, or take your full dose of medicine when you aren't going to eat your usual amount of food.
  • Exercise too much without eating enough food.
  • Skip a meal.
  • Drink too much alcohol, especially on an empty stomach.
  • Take medicines for other conditions that can lower blood sugar, such as large doses of aspirin and medicines for mental health problems.
  • Have problems with your kidneys.
  • Start to have other problems with your glands and hormones, such as Addison's disease or hypothyroidism.

WebMD Medical Reference from Healthwise

Last Updated: September 29, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
1
Next Article:

Today on WebMD

Diabetic tools
Symptoms, diagnosis, treatment, and more.
woman flexing muscles
10 strength training exercises.
 
Blood sugar test
12 practical tips.
Tom Hanks
Stars living with type 1 or type 2.
 
kenneth fujioka, md
Video
Can Vinegar Treat Diabetes
Article
 
Middle aged person
Tool
jennie brand miller
Video
 

Prediabetes How to Prevent Type 2 Diabetes
Article
type 2 diabetes
Slideshow
 
food fitness planner
Tool
feet
Slideshow