diabetes with nausea
Informed by recognized medical guidance
Overview
Diabetes is a condition that causes high levels of sugar (glucose) in your blood. Nausea is a sick, uneasy feeling in your stomach that can happen for many reasons. For people with diabetes, nausea can be related to blood sugar levels, digestive problems, or sometimes an urgent medical issue.
Key facts
- Nausea can be triggered by blood sugar levels that are too high or too low.
- Diabetes can slow down stomach emptying, a condition called gastroparesis, which often causes nausea.
- Nausea with vomiting and high blood sugar can be a sign of a serious emergency called diabetic ketoacidosis.
Nausea is a common symptom that many people with diabetes experience from time to time, especially when blood sugar is very high, very low, or during illnesses.
It can affect anyone with diabetes, but people who have had diabetes for many years, have repeated high blood sugar levels, or have diabetes-related nerve damage are more likely to have digestive problems that cause nausea.
Symptoms
- Difficulty breathing or deep, rapid breathing
- Fruity-smelling breath
- Severe confusion, drowsiness, or passing out
- Vomiting for more than a few hours and unable to keep any fluids down
- Chest pain or severe abdominal pain
- ⚠High blood sugar readings that will not come down
- ⚠Nausea with vomiting that lasts for several hours
- ⚠Signs of dehydration, such as extreme thirst, dry mouth, or little urination
- ⚠You have diabetes and are unwell with a fever and nausea
Common symptoms
- Feeling sick to your stomach
- Vomiting
- Stomach pain or cramps
- Feeling full very quickly after eating small amounts
- Loss of appetite
- Dizziness or weakness
Symptoms in children
- Fussiness or irritability
- Vomiting
- Lack of energy or sleepiness
- Dry mouth or fewer wet nappies
- Deep, rapid breathing or a fruity smell on the breath
Symptoms in older adults
- Confusion or drowsiness
- Loss of appetite
- Vomiting or dry heaving
- Signs of dehydration, such as dark urine or feeling lightheaded
- Unexplained stomach discomfort
Causes
Main causes
- Very high blood sugar (hyperglycemia), which can cause the body to produce acids called ketones
- Very low blood sugar (hypoglycemia), which can make you feel sick and shaky
- Gastroparesis, where the stomach empties food too slowly
- Stomach bugs or other infections
- Certain diabetes medicines or non-diabetes medicines that cause stomach upset
Risk factors
- Long-standing diabetes
- Difficulty keeping blood sugar levels in your target range
- Diabetes-related nerve damage
- Being over 60 years old
- Taking certain medicines that affect the stomach
When to see a doctor
See a doctor urgently if:
- You have emergency symptoms like confusion, trouble breathing, or vomiting that will not stop
- You cannot keep fluids down for more than 12 hours
- Your blood sugar is very high and you have nausea or vomiting
- You have signs of dehydration
Book a routine appointment if:
- You frequently feel sick after meals
- Your blood sugar levels are very unpredictable
- You are losing weight without trying
- Nausea is interfering with your daily life or eating
Diagnosis
Your doctor will ask about your symptoms, check your diabetes management, and do a physical exam. They may also ask about any other medicines you take.
Tests that may be done
- Blood glucose test to check your sugar level
- Blood ketone test to look for acids in your blood
- Urine test for ketones
- Blood tests to check your kidney function and electrolytes
- A gastric emptying study if your doctor suspects gastroparesis
What to expect at your appointment
You may be referred to a diabetes specialist or a stomach specialist (gastroenterologist). Bring a list of your symptoms, blood sugar readings, medicines, and any questions you have. The tests are usually straightforward and can be done at a clinic or hospital.
Treatment
Treatment depends on the cause of the nausea. The main goals are to correct your blood sugar, prevent dehydration, and treat the underlying problem so you feel better and stay safe.
Self-care at home
- Check your blood sugar more often than usual, including before and after meals.
- Drink small sips of water, clear broth, or an oral rehydration drink throughout the day.
- Eat small, bland, low-fat meals, such as crackers, toast, rice, or bananas.
- Avoid high-fat, spicy, or very sweet foods when you feel sick.
- Follow your diabetes team's sick-day plan if you have one.
- Rest and do not do intense exercise until the nausea passes.
Medical treatments
Your healthcare provider may prescribe medicines to control nausea or adjust your diabetes medicines. If you are dehydrated or have ketones, you may receive fluids through a drip in hospital. In some cases, insulin and electrolyte replacement may be needed. Always follow the plan from your diabetes team.
When is surgery considered?
Surgery is rarely needed for nausea related to diabetes. If severe gastroparesis does not improve with other treatments, a specialist team may discuss more advanced procedures, but this is uncommon.
Living with this condition
Keep a record of your nausea episodes, blood sugar levels, and what you ate. This can help you and your healthcare team spot patterns and make changes. Plan ahead with a sick-day kit that includes testing supplies, fluids, and non-sugary snacks.
Lifestyle tips
- Take your diabetes medicines as prescribed by your healthcare provider.
- Try to eat regular, balanced meals and avoid skipping meals.
- Talk to your diabetes team before making any changes to your treatment.
- Learn to recognise early signs of high or low blood sugar so you can act quickly.
Diet and exercise
When you feel sick, stick to plain, starchy foods like crackers or rice and stay hydrated with small, frequent sips. Avoid intense exercise until the nausea resolves. When you are feeling well, regular physical activity helps your body use insulin better and can improve blood sugar control.
Mental health and emotional wellbeing
Living with diabetes and repeated nausea can be exhausting and stressful. It is normal to feel frustrated, anxious, or worried. Talk to your healthcare team about how you are feeling. If you feel low or hopeless, tell someone and ask for support.
Prevention
Nausea related to diabetes can sometimes be prevented by keeping blood sugar levels as close to your target range as possible and following your diabetes care plan. Not all causes can be prevented, but managing your diabetes well lowers the risk.
Vaccines
Stay up to date with recommended vaccinations, including the flu vaccine and others your healthcare provider suggests. Illnesses like the flu can make blood sugar levels harder to control and can trigger nausea.
Screening programmes
Regular diabetes check-ups are important. They help you and your healthcare team find early signs of complications, such as stomach problems or kidney issues, before they become serious.
Complications
If left untreated
- Severe dehydration, which can lead to kidney damage or dangerous electrolyte changes
- Diabetic ketoacidosis, a life-threatening emergency
- Poor nutrition and unexplained weight loss
- Unstable blood sugar levels that are hard to manage
- Damage to the stomach and digestive system over time
Long-term outlook
With the right care, most causes of nausea related to diabetes can be managed safely. Many people improve with simple self-care, blood sugar monitoring, and support from their healthcare team. Even when more serious complications happen, early treatment can make a big difference. Your diabetes team is there to help you feel better and protect your health.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Related conditions
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 31, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.