high sugar on one side

Overview

High blood sugar (hyperglycemia) means there is too much glucose (sugar) in your bloodstream. The phrase 'on one side' is not a medical term. Blood sugar is the same throughout your body, so a reading that seems higher from one finger or arm is usually a testing issue, not a separate condition. However, if you do have high blood sugar, it's a real health condition that needs attention.

Yes. High blood sugar is very common worldwide. It is the main feature of diabetes, which affects over 400 million people. Occasional high readings are even more common and can happen to anyone.

It can affect people of any age. You are more at risk if you have a family history of diabetes, are above a healthy weight, are over 40 (or over 25 in some higher-risk ethnic groups), or are not physically active.

Symptoms

Common symptoms

• Feeling thirstier than usual
• Needing to urinate (pee) more often, especially at night
• Feeling very tired
• Blurred vision
• Headache
• Dry mouth

Symptoms in children

• Same symptoms as adults, plus:
• Bedwetting or needing the bathroom at night
• Weight loss without trying
• Irritability or mood changes
• Nappy rash that doesn't clear up

Symptoms in older adults

• Older adults may have fewer or different symptoms, such as:
• Confusion or drowsiness
• Dizziness or falls
• Frequent infections
• Wounds that heal slowly

Causes

Main causes

• Your body makes a hormone called insulin that moves sugar into your cells. High sugar happens when your body doesn't make enough insulin or can't use it well.
• Eating a meal or snack high in carbohydrates or sugar
• Being ill, like with a cold or infection
• Physical or emotional stress
• If you have diabetes, taking too little medication or missing a dose (ask your care team if this applies to you)

Risk factors

• Family history of diabetes
• Being above a healthy weight
• Age over 40 (or over 25 in South Asian, African-Caribbean, and other higher-risk groups)
• High blood pressure or high cholesterol
• A history of diabetes during pregnancy (gestational diabetes)
• Smoking

When to see a doctor

See a doctor urgently if:

• If you have repeated blood sugar readings above your target range or above 250 mg/dL (13.9 mmol/L) for more than a day
• If you are vomiting, have diarrhea, or cannot keep fluids down
• If you feel unusually tired, confused, or have trouble speaking
• If you are pregnant, a child, or an older adult and have high blood sugar

Book a routine appointment if:

• If you have not been diagnosed with diabetes but have symptoms like constant thirst, frequent urination, or unexpected weight loss
• If you have a family history of diabetes and want a check-up
• If you have diabetes and notice a pattern of higher readings over several days

Diagnosis

A healthcare provider will ask about your symptoms, medical history, and risk factors. They will use a blood test taken from a vein in your arm to confirm whether your blood sugar is high. A finger-prick test at home is useful for monitoring, but it is not used alone for diagnosis.

Tests that may be done

• Fasting blood sugar test: measured after at least 8 hours without food
• HbA1c test: shows your average blood sugar over the past 2 to 3 months
• Oral glucose tolerance test: you drink a sugary drink and your blood sugar is measured over the next few hours

What to expect at your appointment

The tests are quick and simple. You may need to fast (avoid eating and drinking) for 8 hours before some of them. Your provider will explain the results and what they mean for your health. Do not stop any medication unless your provider tells you to.

Treatment

Treatment for high blood sugar depends on the underlying cause. If you have diabetes, the goal is to keep your blood sugar within a target range that you and your healthcare team agree on. This usually involves healthy lifestyle habits and, for many people, medication or insulin. If you do not have diabetes, the focus is on preventing blood sugar from getting too high by making healthier choices.

Self-care at home

• Drink water instead of sugary drinks
• Check your blood sugar regularly if your provider has advised it
• Keep a record of your readings and symptoms to share with your care team
• Eat balanced meals with controlled portions of carbohydrates
• Avoid sugary snacks, sodas, and fruit juices that can spike blood sugar
• Be physically active, like a 30-minute walk on most days
• Take any prescribed medicines exactly as directed

Medical treatments

Your healthcare provider may recommend one or more medications to lower blood sugar. These can include tablets that help your body use insulin better, injections that boost insulin release, or insulin therapy. The right choice depends on your condition, other health problems, and your personal targets. You will get specific instructions on how and when to take them. Never change a dose on your own.

When is surgery considered?

Surgery is not a common treatment for high blood sugar itself. However, some people with type 2 diabetes may be considered for weight-loss (bariatric) surgery if they meet certain criteria. This is always a decision made with a specialist team after full assessment.

Living with this condition

Living with high blood sugar is a daily balance of food, activity, medication, and monitoring. You can lead a full, active life. Learn to notice your symptom patterns, keep your appointments, and reach out for support when you need it.

Lifestyle tips

• Check your feet daily for cuts, blisters, or redness if you have diabetes
• See your dentist regularly — high sugar increases the risk of gum disease
• Have an eye exam every year to check for retinal damage
• Quit smoking to protect your blood vessels
• Manage stress with relaxation exercises, breathing, or hobbies

Diet and exercise

Eat a balanced diet rich in vegetables, whole grains, lean protein, and healthy fats. Limit processed foods, refined sugars, and sweetened drinks. Aim for at least 150 minutes of moderate physical activity each week. If you're not active yet, start slowly and build up. Your healthcare team can help you make a realistic plan.

Mental health and emotional wellbeing

Learning you have high blood sugar or diabetes can feel overwhelming. It's normal to feel worried, sad, angry, or frustrated. These feelings are valid. Talking to a counsellor, joining a support group, or sharing with family and friends can make a big difference. If you feel hopeless or depressed, tell your provider — you are not alone.

Prevention

Type 2 diabetes and high blood sugar can often be prevented or delayed with healthy habits: keep a healthy weight, be active, eat well, and avoid smoking. If you are at high risk, ask your provider about a formal prevention program. Type 1 diabetes cannot be prevented.

Vaccines

There is no vaccine for high blood sugar itself. However, keeping your vaccines up to date is important, because infections can raise your blood sugar. Ask your provider about flu, pneumococcal, and other recommended vaccines.

Screening programmes

If you are 40 or older (or 25 and from a higher-risk ethnic group), or if you have other risk factors, ask your healthcare provider about a blood sugar check. Early screening can catch problems early and help you act sooner.

Complications

If left untreated

• Long-term high blood sugar can damage small blood vessels in the eyes, kidneys, and nerves
• It increases the risk of heart attack, stroke, and poor circulation
• It can slow wound healing, especially in the feet, and raise the risk of infections
• In pregnancy, uncontrolled high sugar can affect the baby's growth and health

Long-term outlook

With proper care, most people with high blood sugar live long, full lives. The key is early diagnosis, regular monitoring, and following your treatment plan. Even small improvements can make a real difference. You are not alone — help and support are available.

Find support

International organisations

• International Diabetes Federation ↗
• American Diabetes Association ↗

Local organisations

• Diabetes UK ↗ · United Kingdom

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.