diabetes with fatigue

Overview

Diabetes is a condition that affects how your body uses sugar for energy. Fatigue is a feeling of extreme tiredness or lack of energy that does not go away with rest. When you have diabetes, fatigue can be a common symptom. It may happen because your blood sugar levels are too high or too low, because your body has trouble using insulin, or because of other factors like poor sleep, stress, or dehydration.

Yes. Fatigue is one of the most common symptoms reported by people with diabetes. Many people with type 1 or type 2 diabetes say they feel tired a lot of the time.

Diabetes-related fatigue can affect anyone with diabetes, including children and older adults. It may also affect people with prediabetes or those at risk of developing diabetes, though it is most commonly discussed in relation to type 1 and type 2 diabetes.

Symptoms

Common symptoms

• Feeling very tired during the day, even after a good night's sleep
• Difficulty concentrating or remembering things ('brain fog')
• Feeling weak, heavy, or lacking motivation
• Needing to nap often or struggling to get out of bed
• Feeling tired after meals, particularly after high-sugar meals

Symptoms in children

• They may be less active or reluctant to play
• They may seem irritable, moody, or less interested in school
• They may complain of feeling tired or 'floppy'
• They may have trouble staying awake in class

Symptoms in older adults

• Fatigue may be dismissed as a normal part of ageing
• It can increase the risk of falls because of weakness
• They may need more help with daily activities
• Fatigue can be a sign of blood sugar swings or another health problem, such as low iron or thyroid trouble

Causes

Main causes

• High blood sugar (hyperglycaemia): when sugar stays in the blood, cells don't get enough energy, causing tiredness.
• Low blood sugar (hypoglycaemia): people who take certain diabetes medicines can experience swings in blood sugar that lead to fatigue.
• Insulin resistance and poor blood sugar control
• Dehydration, which can happen when high sugar levels make you pass more urine
• Poor sleep, including sleep apnoea, which is more common in people with diabetes
• Other conditions such as low iron, an underactive thyroid, or depression

Risk factors

• Blood sugar levels that are not well controlled
• Living with diabetes for a long time
• Other health problems, such as high blood pressure, kidney disease, or nerve damage
• Being overweight or not physically active
• Stress, anxiety, or depression
• Not eating a balanced diet or skipping meals

When to see a doctor

See a doctor urgently if:

• If you have severe fatigue along with any of the urgent symptoms listed above (such as persistent vomiting, fever, or very high/low blood sugar levels), seek care the same day.

Book a routine appointment if:

• If fatigue lasts more than a few weeks or is interfering with your daily life, make a routine appointment with your healthcare provider.

Diagnosis

A healthcare provider will ask about your symptoms, review your diabetes history, and may check your blood sugar control. They will also look for other causes of fatigue, such as anaemia, thyroid disease, poor sleep, or mood changes.

Tests that may be done

• Blood glucose test and HbA1c — a measure of average blood sugar over 2-3 months
• Full blood count to check for anaemia
• Thyroid function test
• Kidney and liver function tests
• Questionnaires about sleep, stress, and mood

What to expect at your appointment

You may be asked to keep a diary of your fatigue, blood sugar readings, meals, activity, and sleep. This helps your provider see patterns. You may also be referred to a dietitian, diabetes educator, or sleep specialist if needed.

Treatment

The main treatment for diabetes-related fatigue is to improve blood sugar control and find the medicines and lifestyle habits that work for you. However, fatigue can also be caused by conditions that are not directly related to diabetes, so a thorough check-up is important.

Self-care at home

• Keep a regular routine for meals, physical activity, and sleep
• Stay well hydrated with drinks like water
• Take your diabetes medicines exactly as prescribed
• Check your blood sugar as your healthcare provider recommends to see patterns
• Avoid large high-sugar meals that can cause blood sugar spikes and crashes

Medical treatments

Your healthcare provider may adjust your diabetes treatment to help stabilise blood sugar levels. If another cause is found, such as anaemia or thyroid disease, that condition may be treated separately. Always talk to your care team before changing any medicine. They will explain the options and support you in making a choice that is right for you.

When is surgery considered?

Surgery is not a standard treatment for fatigue. If you have type 2 diabetes and meet certain criteria, weight-loss (bariatric) surgery may be considered to improve overall health, but this is a personal decision you should discuss carefully with your healthcare team.

Living with this condition

Living with diabetes and fatigue can feel overwhelming. Pacing yourself, celebrating your good days, and being gentle with yourself on difficult days is important. Small changes to your daily habits can make a big difference over time.

Lifestyle tips

• Prioritise sleep: aim for a regular sleep schedule and a restful bedroom environment
• Build movement into your day, even a short walk after meals
• Manage stress with breathing exercises, mindfulness, or talking to someone
• Limit alcohol and avoid smoking
• Stay connected with friends and family, and ask for practical help when you need it

Diet and exercise

Choosing foods that keep your blood sugar steady can help. This often means including fibre-rich vegetables, whole grains, and lean proteins, and reducing sugary drinks and refined carbohydrates. Regular physical activity — like brisk walking, cycling, or swimming — helps the body use insulin better. A dietitian who understands diabetes can give you practical, personalised advice.

Mental health and emotional wellbeing

Fatigue can be frustrating and make you feel low, anxious, or isolated. Living with a long-term condition also adds stress. It is understandable that your mood and wellbeing may suffer. If you are feeling overwhelmed, please tell your healthcare team. They can connect you with mental health support. If you are in crisis, call your local emergency number or a crisis hotline in your area.

Prevention

Fatigue itself cannot always be prevented, but keeping your blood sugar levels well managed, staying active, and getting good quality sleep can reduce the chances of feeling severely tired. If you already live with diabetes, combining regular check-ups with healthy habits is the best way to prevent fatigue from becoming a major problem.

Vaccines

Staying up to date with recommended vaccines (such as flu, COVID-19, and pneumonia) is important, because infections can raise blood sugar levels and make fatigue worse. Ask your healthcare provider which vaccines are right for you.

Screening programmes

Regular diabetes check-ups usually include eye, kidney, and foot checks. Screening tests also pick up problems like anaemia or thyroid disease that can contribute to fatigue. Attend your scheduled appointments so that any emerging issues are caught early.

Complications

If left untreated

• Persistent fatigue can interfere with work, school, and daily tasks
• It may increase the risk of depression
• If high blood sugar continues, it can damage blood vessels, nerves, and organs over time
• Fatigue raises the risk of falls, especially in older adults

Long-term outlook

With the right support, it is often possible to feel better and have more energy. Improvements may take time, and part of the journey is learning what works for your body. Most people with diabetes can live full, active lives, especially when they work closely with their healthcare team and make self-care a priority.

Find support

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