Low blood sugar, or hypoglycemia, can cause shakiness, sweating, hunger, dizziness, anxiety, fast heartbeat, irritability, confusion, blurry vision, or weakness. Symptoms often come on quickly. Severe low blood sugar can cause seizures, loss of consciousness, coma, or death and needs emergency care 1.
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See if you qualify →What does low blood sugar feel like?
Hypoglycemia can feel like your body suddenly loses steady fuel. Many people notice shaking, sweating, hunger, dizziness, nervousness, a fast heartbeat, or feeling weak; brain symptoms can include confusion, irritability, blurry vision, or trouble focusing 1.
Common early symptoms: shaky, sweaty, hungry, anxious, dizzy
Early symptoms happen because the body releases stress hormones when glucose drops. These signals can feel like anxiety: trembling, sweating, a racing heart, hunger, nausea, or a sudden sense that something is wrong 1, 6.
Brain-related symptoms: confusion, irritability, blurry vision, weakness
Your brain depends on glucose. When blood glucose is too low, symptoms may shift from body-alert signs to brain signs: confusion, irritability, headache, blurred vision, weakness, clumsiness, or trouble speaking clearly 3.
Severe symptoms that need emergency help
Severe hypoglycemia means the person cannot safely treat it alone. Passing out, seizure, coma, or inability to swallow can happen and should be treated as an emergency 1, 6.
| Symptom pattern | What it can feel like | What to do |
|---|---|---|
| Early body symptoms | Shaky, sweaty, hungry, anxious, fast heartbeat, dizzy | Check glucose if you can; follow your diabetes care plan or seek guidance if this is new |
| Brain symptoms | Confused, irritable, blurry vision, weak, clumsy, trouble focusing | Use fast-acting carbohydrate if this fits your care plan; do not drive |
| Severe symptoms | Seizure, fainting, unconsciousness, unable to swallow, severe confusion | Use prescribed glucagon if available and call 911 |
| Night symptoms | Nightmares, restless sleep, sweating through sheets, waking tired or confused | Ask a clinician whether overnight glucose checks or a CGM may help |
What blood sugar number is considered too low?
Blood glucose below 70 mg/dL is a common low threshold for many people with diabetes. People without diabetes may be evaluated differently, and symptoms plus measured glucose matter more than a single guess 1, 6.
Why many diabetes plans use 70 mg/dL as a low-blood-glucose threshold
NIDDK and MedlinePlus explain that for many people with diabetes, low blood glucose means a reading below 70 mg/dL. Your own diabetes plan may use a different number, so people with diabetes should ask their care team what level is low for them 1, 6.
Why people without diabetes may be evaluated differently
Low blood sugar without diabetes is less common. MedlinePlus notes that for people without diabetes, hypoglycemia is typically a blood glucose level below 55 mg/dL, but clinicians usually look for a pattern: symptoms, a low measured glucose at the time of symptoms, and improvement when glucose rises 6, 4.
Why symptoms and numbers should be discussed with a clinician
Symptoms can overlap with anxiety, dehydration, infection, medication side effects, and heart rhythm problems. If symptoms repeat, or if a meter or continuous glucose monitor shows lows, bring those records to a clinician rather than self-diagnosing 3.
What causes low blood sugar in people with diabetes?
Diabetes-related hypoglycemia most often happens when glucose-lowering treatment, food, activity, alcohol, or illness are out of balance. It is more common in type 1 diabetes and in type 2 diabetes when insulin or insulin-releasing medicines are used 1.
Insulin and medicines that increase insulin release
Insulin can lower blood glucose too much if the timing, amount, meal size, or activity level does not match. Sulfonylureas and meglitinides, which help the pancreas release insulin, can also raise hypoglycemia risk 1, 7.
Skipped or delayed meals
Carbohydrates are a major source of glucose. Skipping a meal, delaying a meal, eating less than planned, or vomiting after taking diabetes medication can lead to a low 6.
More physical activity than usual
Muscles use glucose during activity. More activity than usual can lower glucose during exercise or later, especially when insulin or insulin-releasing medicines are active 1.
Alcohol without enough food
Alcohol can make hypoglycemia more likely, especially when a person drinks without enough food. It can also make low-blood-sugar symptoms harder to notice 6.
Illness, vomiting, or reduced food intake
Illness can change eating, hydration, medication timing, and glucose needs. People with diabetes should follow their sick-day plan and contact their care team if they cannot keep food or fluids down 1.
Can you have low blood sugar without diabetes?
Yes, but non-diabetic hypoglycemia is less common than diabetes-related hypoglycemia. Repeated symptoms should be evaluated because causes can include medication effects, alcohol, liver or kidney disease, hormone problems, prior bariatric surgery, or rare insulin-related conditions 3, 4.
Reactive hypoglycemia after meals
Reactive hypoglycemia means symptoms and low measured glucose happen after eating. It can occur after some types of bariatric surgery and may also be investigated when symptoms reliably occur after meals 4.
Fasting hypoglycemia and medical causes
Fasting hypoglycemia means low glucose occurs after not eating for a while. Possible causes include liver disease, kidney disease, hormone deficiencies, alcohol-related hypoglycemia, severe illness, and rare tumors that make insulin or insulin-like substances 3, 4.
Medication-related low blood sugar
Some medicines can lower glucose or interact with diabetes medicines. If symptoms started after a medication change, bring the medicine list, supplement list, and glucose readings to a clinician 6.
When repeated symptoms should be evaluated
If you do not have diabetes and keep having episodes that feel like low blood sugar, do not assume the cause. A clinician may check glucose during symptoms and decide whether labs, medication review, nutrition review, or endocrine testing is needed 3, 4.
How do you raise low blood sugar safely?
For many adults with diabetes, 15 grams of fast-acting carbohydrate followed by a glucose recheck about 15 minutes later is commonly recommended for mild to moderate lows. This is general education, not a substitute for your personal diabetes plan 2.
The 15-15 rule for many adults with diabetes
The American Diabetes Association describes the 15-15 rule as taking 15 grams of fast-acting carbohydrate, waiting 15 minutes, and rechecking glucose. If glucose remains below 70 mg/dL or a CGM is not trending up, another 15 grams may be used under that plan 2.
Fast-acting carbohydrate examples
- Glucose tablets or glucose gel
- Fruit juice
- Regular soda, not diet soda
- Sugar, corn syrup, or honey for children older than 1 year
- Hard candies or jellybeans, if the person can chew and swallow safely
These options are listed by the American Diabetes Association as examples of fast-acting carbohydrates for low blood glucose 2.
Why chocolate, peanut butter, high-fat foods, and high-fiber foods may work more slowly
Foods high in fat, fiber, or protein can slow digestion. The American Diabetes Association notes that chocolate and peanut butter are not the best first choice when fast-acting carbohydrates are available 2.
What to do after blood sugar rises
If glucose rises and the next meal is not soon, many diabetes plans include a snack with carbohydrate and protein to help keep glucose from dropping again. Examples and timing should come from the person’s own care plan 2.
Why children may need individualized instructions
Children may need different carbohydrate amounts based on age, size, medicines, and glucose pattern. Parents and caregivers should follow the child’s diabetes care plan and ask the child’s clinician for written low-glucose instructions 1.
What are the warning signs of low blood sugar during sleep?
Nocturnal hypoglycemia means low blood glucose during sleep. It can cause nightmares, crying out, restless sleep, sweating through pajamas or sheets, and waking tired, irritable, or confused 1.
Nightmares, crying out, or restless sleep
Low glucose can trigger stress-hormone symptoms while asleep. A bed partner or caregiver may notice restless sleep, nightmares, crying out, or unusual movements 1.
Sweating through pajamas or sheets
Waking up sweaty, especially if sheets or pajamas are soaked, can be a sign of overnight low glucose. It is not specific, so checking glucose and discussing patterns matters 1.
Waking tired, irritable, or confused
Some people wake with a headache, fatigue, irritability, or confusion after an overnight low. Repeated morning symptoms should be reviewed with a clinician 1.
When to ask about a continuous glucose monitor
A continuous glucose monitor, or CGM, tracks glucose through the day and night and can alarm when glucose drops below a set range. It may help some people with frequent lows or hypoglycemia unawareness, a pattern where warning symptoms are reduced or absent 1. You can read more in our guide to continuous glucose monitoring systems.
When is low blood sugar an emergency?
Severe hypoglycemia is an emergency when a person cannot safely treat themselves. Seizure, fainting, unconsciousness, inability to swallow, or severe confusion needs urgent help 1.
Seizure, fainting, unconsciousness, or inability to swallow
These signs mean the brain may not be getting enough glucose and the person may choke if given food or drink. Emergency services should be called right away 1, 6.
Why not to give food or drink to someone who is unconscious or very confused
Food or liquid can go into the airway if a person cannot swallow safely. In that situation, use prescribed glucagon if available and call 911 1.
Glucagon for severe hypoglycemia
Glucagon is a rescue medicine used for severe low blood sugar. People at risk for severe hypoglycemia should ask their diabetes care team whether glucagon should be prescribed and whether family, roommates, coworkers, or caregivers should learn how to use it 1, 7.
When to call 911
Call 911 if the person is unconscious, has a seizure, cannot swallow, is severely confused, does not improve after rescue steps, or you are not sure what is happening. It is safer to get emergency help than to wait during a severe low 1.
How can you prevent low blood sugar from happening again?
Preventing repeat lows starts with finding the pattern. Tracking glucose, meals, activity, alcohol, illness, and medicine timing can help your care team adjust the plan safely 1.
Reviewing diabetes medicines with a care team
If lows are happening, a clinician may review insulin timing, insulin dose, sulfonylureas, meglitinides, kidney function, meal timing, and other medicines. Do not stop or change prescribed diabetes medication without medical guidance 7.
Meal timing, carbohydrate intake, and activity planning
Meal timing and carbohydrate intake matter most when glucose-lowering medicines are active. More activity than usual, delayed meals, or alcohol without food can all raise the chance of a low 1.
Using a glucose meter or CGM when appropriate
A blood glucose meter can confirm a finger-stick glucose during symptoms. A CGM can show trends, including overnight drops, but readings can lag behind blood glucose, so people should follow their care plan for when to confirm with a meter 1. For device basics, see our guides to blood glucose meters and blood sugar levels.
Tracking patterns and triggers
Write down when symptoms happen, the glucose number if checked, what you ate, recent activity, alcohol, illness, and medicines. Patterns are often more useful than one isolated number 3.
| Your situation | Sensible next step | Why it matters |
|---|---|---|
| You have diabetes and a glucose reading below your low threshold | Follow your personal diabetes plan; use fast-acting carbs if that is part of it | Diabetes plans often define lows and rescue steps in advance |
| You have severe confusion, seizure, fainting, or cannot swallow | Call 911; use prescribed glucagon if available | This can be life-threatening and is not safe to manage alone |
| You do not have diabetes but symptoms keep repeating | Schedule medical evaluation and try to document glucose during symptoms | Non-diabetic hypoglycemia is less common and needs a cause-based workup |
| Symptoms happen overnight | Ask about overnight glucose checks or CGM | Nocturnal hypoglycemia can be missed without monitoring |
| Symptoms are part of a broader weight or metabolic-health concern | Review glucose history, medicines, and weight goals with a clinician | Weight-loss medicines may not fit people with recurrent lows without careful review |
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Have metabolic-health questions beyond emergency symptoms?
Chia does not treat emergency hypoglycemia. If your concern is weight or metabolic health, our licensed providers can review your history online and discuss options when appropriate. A prescription requires a medical evaluation and is not guaranteed. Compounded drugs are not FDA-approved.
How can Chia help if blood sugar symptoms are part of a weight or metabolic-health concern?
Chia does not treat emergency hypoglycemia. If you are having severe low-blood-sugar symptoms, call emergency services or follow your diabetes emergency plan. Where we may fit is a non-emergency review of weight, metabolic health, and medication history for people considering clinician-guided weight-loss treatment.
Chia does not treat emergency hypoglycemia
Our online care model is not built for urgent low-glucose episodes, seizure, fainting, or severe confusion. Those symptoms need in-person emergency care.
How Chia’s licensed providers evaluate weight-loss treatment eligibility online
At Chia, care starts with a short online health questionnaire. A licensed US provider reviews your medical history, medications, goals, and safety factors, then prescribes only when clinically appropriate; a prescription is never guaranteed.
Semaglutide and tirzepatide at Chia for eligible weight-loss patients
Chia offers compounded semaglutide injection and compounded tirzepatide tablets or injections for eligible weight-loss patients. Semaglutide is the active ingredient in Ozempic and Wegovy and is a GLP-1 receptor agonist; tirzepatide is the active ingredient in Mounjaro and Zepbound and is a dual GIP/GLP-1 receptor agonist. Compounded formulations are not FDA-approved and do not have FDA-evaluated outcomes data.
FDA labeling for semaglutide and tirzepatide products warns that hypoglycemia risk can be higher when these medicines are used with insulin or medicines that increase insulin secretion, such as sulfonylureas 8, 9. That is why people using diabetes medicines or having recurrent lows need careful clinician review before weight-loss treatment.
| Chia option | Forms listed in Chia’s catalog | Current starting price | Fit to discuss with a provider |
|---|---|---|---|
| Semaglutide | Injection | Plans currently start at $249/mo | For eligible weight-loss patients after online medical review |
| Tirzepatide | Tablets or injection; microdosing plans available | Plans currently start at $249/mo for tablets and $299/mo for injection | For eligible weight-loss patients who want provider-guided options |
| Weight + Energy | NAD+ injection plus choice of GLP-1 | Plans currently start at $309/mo | For eligible patients whose goals include weight and energy support |
| Weight + Muscle | Sermorelin injection plus choice of GLP-1 | Plans currently start at $329/mo | For eligible patients whose goals include weight and muscle support |
Why people with diabetes medications or recurrent lows need clinician review before weight-loss treatment
GLP-1 and GIP/GLP-1 medicines do not usually cause low blood sugar by themselves in the same way insulin can, but risk changes when they are combined with insulin or insulin-releasing medicines 8, 9. If you have type 1 diabetes, type 2 diabetes, hypoglycemia unawareness, recurrent lows, kidney disease, liver disease, or a history of bariatric surgery, a clinician should review the details before any weight-loss medication is considered.
What changes over time if low blood sugar keeps happening?
Repeat lows can become harder to notice. Hypoglycemia unawareness can develop when the body has fewer warning symptoms before glucose falls into a dangerous range 1.
Over time, a clinician may adjust medicine timing, meal plans, activity plans, alcohol guidance, monitoring tools, or glucagon access. For people with diabetes, the goal is not just fixing one low; it is reducing the pattern that caused it.
If you are tracking home readings, our normal blood sugar levels chart can help you understand common ranges, and our article on type 2 diabetes blood sugar levels explains targets used in diabetes care.
When should you get help now?
Get emergency help now for seizure, fainting, unconsciousness, inability to swallow, severe confusion, or symptoms that do not improve after the rescue steps in a diabetes care plan. Repeated non-emergency symptoms also deserve medical review, especially if you do not have diabetes 1, 4.
- Call 911 for seizure, unconsciousness, or inability to swallow.
- Do not drive during symptoms that could be low blood sugar.
- If you have diabetes, follow your written diabetes plan and contact your care team after repeat lows.
- If you do not have diabetes, seek evaluation rather than repeatedly self-treating symptoms as hypoglycemia.
- If symptoms began after a medication change, contact the prescribing clinician.
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Start with a clinician-reviewed metabolic-health visit
If your symptoms are not an emergency and your goal is weight or metabolic health, Chia can review eligibility online for options such as semaglutide or tirzepatide. A prescription requires a licensed-provider evaluation and is not guaranteed. Compounded drugs are not FDA-approved and are filled by state-licensed 503A compounding pharmacies when prescribed.
FAQ
Five common signs are shakiness, sweating, hunger, dizziness, and anxiety or a fast heartbeat. Some people also have confusion, irritability, blurry vision, weakness, or headache.
For many adults with diabetes, fast-acting carbohydrates are commonly used first. Examples include glucose tablets, glucose gel, fruit juice, regular soda, sugar, or hard candies if the person can swallow safely. Follow your personal diabetes plan.
If you do not have diabetes and symptoms keep happening, the safest step is medical evaluation. A clinician may try to confirm whether glucose is truly low during symptoms and look for causes such as medicines, alcohol, hormone problems, liver or kidney disease, or prior weight-loss surgery.
Mild symptoms may improve if glucose rises, but waiting can be risky, especially for people with diabetes or anyone with confusion, weakness, or worsening symptoms. Severe symptoms need emergency help.
Yes. Anxiety and low blood sugar can both cause shakiness, sweating, fast heartbeat, dizziness, and a sense of panic. Checking glucose during symptoms can help separate the two, but repeated symptoms should be discussed with a clinician.
GLP-1 and GIP/GLP-1 medicines are more likely to raise low-blood-sugar concern when used with insulin or medicines that make the pancreas release insulin, such as sulfonylureas. Compounded semaglutide and compounded tirzepatide are not FDA-approved and should be used only with clinician review when prescribed.
A glucose meter can check a blood glucose value during symptoms. A CGM can show trends and overnight drops, but it may lag behind blood glucose. Ask your clinician which tool fits your situation.
References
- 1.National Institute of Diabetes and Digestive and Kidney Diseases. Low Blood Glucose (Hypoglycemia). National Institutes of Health; accessed 2026.
- 2.American Diabetes Association. What are the signs of low blood glucose (hypoglycemia)? American Diabetes Association; accessed 2026.
- 3.Cryer PE, Axelrod L, Grossman AB, et al. Hypoglycemia. Endotext. National Center for Biotechnology Information; updated 2024.
- 4.Non-Diabetic Hypoglycemia: Evaluation and Management. Journal article available through PubMed Central; 2025.
- 5.Diabetes: how to manage patients experiencing hypoglycaemia. Journal article available through PubMed Central; 2022.
- 6.MedlinePlus. Hypoglycemia. U.S. National Library of Medicine; accessed 2026.
- 7.American Diabetes Association Professional Practice Committee. Standards of Care in Diabetes—2026. Diabetes Care; 2026.
- 8.U.S. Food and Drug Administration. Wegovy (semaglutide) prescribing information. FDA; 2026.
- 9.U.S. Food and Drug Administration. Zepbound (tirzepatide) prescribing information. FDA; 2026.
About this article
Chia Health Editorial Team — Evidence-reviewed health education
This article is for educational purposes only and is not a substitute for individualized medical advice. Talk to a licensed clinician before starting, stopping, or changing any prescription.
AI tools may assist with research and drafting. Chia's editorial team reviews source use, clarity, treatment information, and safety framing before publication. A clinician is named only after explicit sign-off. Read our editorial standards.
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