high sugar flare ups

Overview

A high blood sugar flare-up, sometimes called a blood sugar spike, is a temporary rise in the amount of sugar (glucose) in your blood. Glucose is the main fuel your body uses for energy. When it is too high, it can make you feel unwell and over time can damage your body if not managed.

Yes. Blood sugar spikes are very common, especially for people living with diabetes. Almost everyone with diabetes experiences them from time to time.

Anyone can have a high blood sugar flare-up, but they are especially important for people with type 1 diabetes, type 2 diabetes, or prediabetes. Hormonal changes and metabolism issues also play a role.

Symptoms

Common symptoms

• Increased thirst
• Frequent urination
• Feeling very tired
• Dry mouth
• Blurred vision
• Headache
• Difficulty concentrating

Symptoms in children

• Irritability or mood swings
• Bedwetting (if the child was previously dry at night)
• Increased thirst and urination
• Stomach ache
• Unusual tiredness

Symptoms in older adults

• Confusion or feeling mentally foggy
• Dizziness when standing up
• Extreme fatigue
• Dry, itchy skin
• Slow-healing cuts or sores

Causes

Main causes

• Skipping or not taking enough medication (like insulin or tablets)
• Eating more carbohydrates than usual
• Being less physically active than usual
• Stressing more than usual (physical or emotional stress)
• An infection or illness, such as a cold or urinary tract infection
• Hormonal changes, for example during a period or from a hormonal condition

Risk factors

• Living with diabetes (type 1 or type 2) or prediabetes
• Taking certain medicines that can raise blood sugar (review with your doctor)
• Having a sedentary lifestyle
• Carrying extra weight around the belly
• Eating a diet high in sugary drinks and refined carbohydrates
• Having a family history of diabetes

When to see a doctor

See a doctor urgently if:

• If you have emergency symptoms listed above, call your local emergency number now.
• If you cannot keep fluids down because of vomiting, get same-day medical advice.

Book a routine appointment if:

• If you notice your blood sugar readings are frequently high, make an appointment to review your care plan.
• If you experience symptoms like increased thirst or frequent urination that do not go away, talk to your doctor.
• If you need help adjusting your medicines or diet, see your diabetes care team.

Diagnosis

A healthcare provider diagnoses high blood sugar episodes by asking about your symptoms, checking your blood sugar with a small finger-prick test or a continuous glucose monitor, and sometimes ordering a laboratory test.

Tests that may be done

• Finger-prick blood sugar test
• A1C test (measures your average blood sugar over the last 2–3 months)
• Fasting blood sugar test (after not eating for at least 8 hours)
• Ketone test (if your provider worries about a serious complication)

What to expect at your appointment

Your provider will explain what your numbers mean and how to manage future flare-ups. You may be asked to keep a diary of your readings, meals, and activities.

Treatment

Treatment for high blood sugar flare-ups focuses on bringing your blood sugar back into a safe range quickly and preventing future episodes. Your care plan will be tailored to your specific needs.

Self-care at home

• Drink plenty of water to stay hydrated and help your kidneys flush out excess sugar.
• Go for a walk or do light physical activity to help your muscles use glucose, if you feel able.
• Follow your meal plan – choose water or unsweetened drinks and avoid sugary snacks.
• Check your blood sugar as your provider recommends and keep a record of the readings.
• Let someone you trust know if you are feeling unwell.

Medical treatments

Medicines for high blood sugar are available, including oral tablets (taken by mouth) and injectable therapies such as insulin. Your doctor will decide what is needed based on your blood sugar patterns, your overall health, and your preferences. Never start, stop, or change a medicine on your own.

When is surgery considered?

Surgery is not a usual treatment for high blood sugar flares. However, for some people with type 2 diabetes and certain other metabolic conditions, weight-loss (bariatric) surgery may be discussed as part of a long-term plan. Your doctor will explain the risks and benefits thoroughly if it is considered.

Living with this condition

Living with blood sugar flare-ups means building small habits that keep your glucose steady. Check your sugar as advised, take your medicines on time, and notice how your body feels when your blood sugar is high so you can act early.

Lifestyle tips

• Keep a regular sleep schedule – lack of sleep can raise blood sugar.
• Manage stress with relaxation techniques, hobbies, or talking to a counsellor.
• Limit alcohol – it can interfere with blood sugar control.
• Wear a medical ID bracelet or carry a card that says you have diabetes.
• Involve your family and friends in your care so they can support you.

Diet and exercise

A balanced diet with plenty of vegetables, whole grains, lean proteins, and healthy fats can help keep blood sugar steady. Spread your meals across the day and watch portion sizes. Regular exercise – like brisk walking, cycling, or swimming – helps your body use sugar better. Always check with your doctor before starting a new exercise routine.

Mental health and emotional wellbeing

Dealing with high blood sugar flare-ups can be stressful and can affect your mood. It is common to feel anxious, frustrated, or even guilty. These feelings are normal. Remember that blood sugar fluctuates for many reasons, and it is not a sign of personal failure.

Prevention

You can prevent many high blood sugar flare-ups by following your diabetes care plan: taking your medicines correctly, eating a balanced diet, staying active, and checking your blood sugar as recommended. Regular appointments with your healthcare team also help catch problems early.

Vaccines

Staying up to date on recommended vaccines is important, because infections can raise blood sugar and make managing diabetes harder. Ask your pharmacist or local health service which vaccinations are recommended for you.

Screening programmes

If you have risk factors for prediabetes or diabetes, ask your doctor about routine blood sugar screening. Catching high blood sugar early can help you take action before it causes long-term problems.

Complications

If left untreated

• Repeated high blood sugar flare-ups can damage blood vessels over time.
• Problems with nerves (neuropathy), leading to pain, tingling, or numbness in the hands and feet.
• Kidney disease (nephropathy).
• Eye damage (retinopathy), which can affect vision.
• Increased risk of heart attack and stroke.
• Poor wound healing, which can lead to infections, especially on the feet.

Long-term outlook

With good management, most people with high blood sugar flare-ups can avoid serious complications and live a full, active life. The key is to work closely with your healthcare team, follow your care plan, and ask for help when you need it. Many people successfully manage diabetes with the right support.

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