Does High Blood Sugar Cause Fatigue and Tired Feeling?

In fact, fatigue & tired feeling are pretty common in people with hyperglycemia or high blood sugar. Hyperglycemia is a condition when the amount of glucose (a simple form of sugar) in the bloodstream is higher than normal. High blood glucose in the bloodstream can be a signal that glucose metabolism does not work as well as should be.

How does glucose metabolism work?

The performance of your glucose metabolism is closely associated with the fluctuation of your blood sugar. In most healthy people with good glucose metabolism, their blood glucose levels do not fluctuate widely throughout the day.

Typically, your blood glucose reaches its peak level during eating and after meal. And for the lowest level, it usually occurs between meals. And if you are fasting for at least 8 hours, your blood sugar also can be pretty low.

high_blood_sugar_fatigue_illustrationThe fit status of your hormone insulin is very crucial for your glucose metabolism. Without this hormone, your body cannot convert the glucose taken from food that you eat to become energy. To get a specific amount of energy, glucose taken from food need to be absorbed first by cells and muscles of the body from the bloodstream. And insulin has a significant contribution for the mechanism of this absorption.

Your pancreas is the major organ that produces insulin and releases it into the bloodstream. When your body notices that the level of glucose in the bloodstream is high (such as after eating), the brain will send a signal to the pancreas to release insulin into the bloodstream. Insulin then will help glucose to be easier to go and enter into the cells and muscles. Then glucose will be converted into energy and will be used to support your activity throughout the day.

Not all glucose is directly converted to become energy. Some may be stored in your liver as glycogen and in your fat cells as ‘fat’, which both can be converted again into energy when your body needs.

How does high blood sugar cause fatigue, weakness, and tired feeling?

The symptoms of tired feeling, weakness, and fatigue are usually caused by the lack of energy supply for your body. If you have clearly understood the mechanism of glucose metabolism (as written before), now you should be very easy to understand the correlation between these symptoms and high blood sugar!

When the glucose in the blood is poorly absorbed or even cannot be properly absorbed by your muscles or cells of your body as it should be, your blood sugar is easier to rise and you cannot get adequate amount of energy that meet to your body needs.

Even high blood glucose also can be potential tocause unusual weight loss – if there is poor energy converted from glucose, then there is also no excess energy to be stored as fat in your fat cells.

In diabetics and non-diabetics, the following are some bad lifestyles and habits that can increase the risk of developing high blood sugar:

  1. Lack of physical activity – if you are physically inactive, you are relative easier to have hyperglycemia than others who keep active. Regular exercise is important to improve and maintain your insulin sensitivity.
  2. Poor diet – here is a helpful section about some best foods to lower blood sugar.
  3. Taking a large meal at once. Eating a lot of foods (especially for foods high in carbohydrate and high in saturated fat) can make your insulin work harder in regulating glucose in the blood, because glucose taken from foods that you consume can be absorbed directly by the bloodstream. As a result, your blood glucose can rise suddenly after eating.
  4. Skipping your regular meals (breakfast, lunch, and dinner) or eating irregularly. It is important to maintain and stick with the pattern of your regular meals in order to also maintain and help your insulin to work regularly.

Having high blood sugar symptoms should not be ignored. Prolonged this condition can increase your risk of developing type-2 diabetes.


  • John

    There’s a very dangerous myth going around right now online, and that’s the myth that “juicing” is the “cure all to BEAT all” when it comes to everything that could possibly ail you!!! NOT true! I started juicing mostly green vegetables, including raw, freshly harvested cactus pads. Those things helped regulate my blood-sugar levels. But, …. BUT!!! … I also juiced oranges and grapefruits in small amounts twice a day, a small slice of apple twice a day, two baby carrots twice a day, a few small slices of red beet twice a day, and a small serving of frozen berries twice a day! The result was not good at all, but instead DEVASTATING! Though I did not consume large amounts of the “sweet stuff” on a daily basis, It added up WAY too fast!!! My fkn blood-sugar went HALF WAY TO THE MOON!!! Though I consumed the “sweet” fruits and veggies is small amounts, they added up ASTRONOMICALLY! I was wondering why these juice-doses kept “knocking me out!!!” My blood-sugar was shootin’ through the ROOF!!! Friend, I’m going to level with you, here: If you have serious, tardive ( tardive means serious, chronic, potentially LETHAL! ) DIABETES, You can NOT juice sweet fruits and vegetables, perhaps AT ALL!!!!! Believe me, diabetes is an extremely precarious “high-wire-balancing” act!!! If you fall, the only “net” that may catch you may be the a fast trip to the EMERGENCY ROOM!!! I have diabetes and it’s just about as bad as diabetes can GET! No kidding! You can ,indeed, get diabetes SO bad that just ONE SLICE OF APPLE can send you blood-sugar SOARING!!!! And if your diabetes is THAT bad, you no doubt require multiple INSULIN INJECTIONS throughout the day!!!!!! Yeah, right,… just “juice your way to health!!!” I damn near “JUICED” my way to an EARLY GRAVE!!! I even ate PANCAKES the following morning, and even THEY didn’t hurt me as badly as those FRUIT JUICES did!!!!!!!!!!!!!!!!! And thanks to all the new “myths” surrounding this new “juicing” craze, I thought that what I was experiencing was ,…. DETOX!!! HA HA HA HA HA HA!!!! I guess I DESERVE to be “laughed at!!!” “DETOX!” What a JOKE! I could have DIED thinking that I was merely experiencing,….”DETOX!!!!!” The only “detox” ” I ” needed was INSULIN INJECTIONS!!! What now “worries” ME is the thought of how many OTHER people there are out there who have been “duped” ( by these wild-eyed juicing “promoters” ) into making the same mistake that ” I ” made!!!!!!
    Dammit, I’m SERIOUS!!!!! DO NOT believe the “hype” in pertaints to the new “juicing” trend!!! If you have tardive DIABETES, you can juice your way to health — OR AN EARLY “GRAVE!!!” — depending upon WHAT you juice!!!!!! When you are tardive DIABETIC, sugar beets are POISON to you!!! So are oranges, grapefruits, apples, potatoes of ANY kind, blackberries, blueberries, cherries, carrots, etc, …because YOUR BODY CANNOT PROCESS THE SUGARS!!!! And JUICING will send exceedingly high levels of sugar ( or fructose ) RIGHT INTO YOUR BLOODSTREAM!!!!! Even WITHOUT diabetes, a person’s blood-sugar would really SPIKE!!!! But with diabetes, your system has very little or even NO ability to get your blood-sugar-levels back to NORMAL again,… nor can it transform the sugars into usable INSULIN!!!!!! If Popeye had tardive diabetes, and he had juiced 3 apples, two oranges, and a sugar-beet, he would have needed a lot more that a can of SPINACH to save his ass!!! Seriously, no joke!!! I listened to all this “juicing will save you” hype. I damn near ended up KILLING myself, all the while mistaking my symptoms for,, … DETOX!!! I feel kind of like the guy who’s so-called “best friend” just shoved him off a high CLIFF!*** Juicing can help you MANAGE your diabetes, but contrary to popular belief, it WILL NOT CURE you!!! FAR FROM IT!!!!
    This “juicing will cure you of EVERYTHING” myth is one of the most DANGEROUS myths of this 21st Century!!!! WHO KNOWS how many people may have already DIED because they tried to “juice their way to perfect health” only to be KILLED by their skyrocketing BLOOD-SUGAR levels!!!! ???
    Right now, our nation’s emergency rooms, could be FILLED with “county bumpkin diabetics” ( like MYSELF! ) who are sending their blood-sugar levels through the ROOF thinking that they can just “juice a bunch of fruits and vegetables” to get HEALTHY!!! On the count of “three”, everybody!!, one,.. two,… three,…. “WHOOOOPS!!!!!”