A diabetic coma is a serious medical emergency that can affect people with both type 1 and type 2 diabetes. If you have diabetes or know someone who does, you may have questions about diabetic comas, including how long a diabetic coma can last and how to treat and prevent them.
There are a number of factors that can cause or complicate a diabetic coma, so the short answer is that it depends on the type of diabetic coma the affected individual is experiencing. Read on for a full breakdown of diabetic coma causes, warning signs, treatment, and prevention.
What is a Diabetic Coma?
A diabetic coma is a medical emergency wherein an individual loses consciousness as a result of a severe imbalance in their insulin and glucose levels. Diabetic comas are relatively uncommon, but they occur often enough that it is important to be aware of the potential causes, signs, and symptoms, both to protect yourself and to recognize when someone you love needs immediate help.
What Causes a Diabetic Coma?
A diabetic coma is most often caused by either hyperglycemia or hypoglycemia, conditions that occur at opposite ends of the blood glucose spectrum. Extremely high blood glucose levels, or hyperglycemia, frequently cause dehydration, which can progress to a loss of consciousness. Extremely low blood sugar levels, or hypoglycemia, deprive the brain of glucose and can equally trigger a diabetic coma.
If you want to understand how dehydration specifically plays a role in diabetic emergencies, our guide on when dehydration requires IV fluids and emergency care explains the escalation process and treatment options in detail.
Another less common but serious cause of diabetic comas is diabetic ketoacidosis (DKA). When blood sugar levels are too low, the body begins burning fat for energy, which produces ketones. When ketone levels in the blood become dangerously elevated, the blood becomes more acidic, a state that can make you seriously ill, trigger a diabetic coma, or in extreme cases, lead to death. People with type 1 diabetes carry a higher risk for DKA, though it can occur in anyone with diabetes.
Signs and Symptoms
Because any of the above conditions can cause someone to enter a diabetic coma, it is vital to understand the warning signs of each and know when to seek emergency help. These are not exhaustive lists, and you do not need to experience every symptom before reaching out for medical attention.
If you suspect that you or a loved one is experiencing signs of high or low blood sugar or elevated ketone levels, check blood sugar levels immediately and seek professional care without delay.
Signs of Hyperglycemia
- Dehydration, increased thirst, or dry mouth
- Frequent urination
- Blurry vision
- Fatigue and headaches
- Fruity or sweet smelling breath
- Weakness and confusion
- Nausea and vomiting
Signs of Hypoglycemia
- Pale skin
- Exhaustion or fatigue
- Shaking or trembling
- Hunger or nausea
- Heart palpitations or an irregular heartbeat
- Moodiness (irritability or anxiety)
- Tingling or numb lips and mouth
- Confusion or inability to concentrate
- Blurry or tunnel vision
- Seizures
Signs of Diabetic Ketoacidosis (DKA)
- Dehydration or dry mouth
- Frequent urination
- Fatigue
- Nausea and vomiting
- Confusion or inability to concentrate
- Fruity or sweet smelling breath
- Difficulty breathing
It is worth noting that several of these symptoms, particularly confusion, nausea, and fatigue, can overlap with other medical emergencies. Understanding reasons to go to the emergency room and being able to recognize when symptoms are escalating can be the difference between timely treatment and a life-threatening outcome.
What Happens if a Diabetic Coma Goes Untreated?
Diabetic comas are medical emergencies that require immediate professional attention. If someone you love is in a diabetic coma, do not attempt to wake them on your own or wait for them to naturally recover. The only way to come out of a diabetic coma is to restore blood glucose levels to a healthy range, a process that can only be safely managed by a medical professional.
Because only a qualified provider can treat a diabetic coma, there is no fixed answer for how long one can last. It will ultimately continue until the individual receives proper medical intervention. Left untreated, a diabetic coma can result in irreversible brain damage or death. Time is critical, do not delay calling 911
How to Recover from a Diabetic Coma
Individuals who receive prompt professional treatment for a diabetic coma typically make full recoveries. Because treatment centers on restoring blood glucose to a normal range, most patients begin to improve rapidly once care begins and tend to regain consciousness shortly after treatment starts.
During recovery, your doctor may make several recommendations to help prevent a diabetic coma from recurring. These may include wearing a medical identification bracelet so that bystanders can respond appropriately in a future emergency. Your physician may also work with you to develop a more effective plan for monitoring your blood sugar levels.
Routine blood testing plays an important role in tracking glucose patterns and identifying imbalances before they become dangerous. If you are newly diagnosed with diabetes following a coma, your doctor will walk you through a full treatment plan covering medications, dietary adjustments, and lifestyle changes.
Preventing a Diabetic Coma
Diabetic coma prevention primarily involves the consistent monitoring of blood sugar levels to avoid hyperglycemia, hypoglycemia, or DKA. Staying aware of your baseline glucose levels and recognizing early signs of imbalance allows you to make corrections before a crisis develops.
Traditional diabetes management typically involves injecting insulin up to four or five times per day and checking blood glucose levels up to three times per day, a regimen that can be difficult to maintain consistently, particularly for those who work or attend school.
For those who need more support, continuous glucose monitors (CGMs) and insulin pumps offer less manual alternatives. A CGM uses a sensor placed under the skin to monitor your blood sugar levels every few minutes throughout the day and night, displaying readings in real time. Insulin pumps work by delivering a steady, controlled stream of insulin around the clock, more closely mimicking the body’s natural processes than periodic injections.
Preparation is equally important. People with diabetes are commonly advised to carry glucose tablets in case blood sugar drops suddenly. If blood sugar rises too high, physical activity can help bring it down, though exercise should be avoided if DKA is suspected, as it can increase ketone levels and worsen the condition.
Diabetic Coma Care at Village Emergency Centers
Remember that this blog is meant for informational purposes only and should not be used in place of professional medical advice. If you or someone nearby is experiencing symptoms of hyper- or hypoglycemia, or if someone loses consciousness, call 911 and seek emergency care immediately. At Village Emergency Centers, our trained medical team is available 24 hours a day to evaluate and treat diabetic emergencies with no wait times and expert care you can trust.