Low blood sugar in older adults is common and can be harder to spot. The American Diabetes Association's 2026 guidance says older adults have a greater risk of lows, especially with insulin, sulfonylureas, or meglitinides, and may be less able to recognize symptoms or tell others. A clear plan, care partners who know the signs, and regular plan reviews help lower the risk.
Key takeaways
- ADA 2026 says older adults with diabetes have a greater risk of low blood sugar (hypoglycemia), especially with insulin, sulfonylureas, or meglitinides.
- Older adults may be less able to recognize symptoms and tell others what they need, so care partners should learn the warning signs.
- Irregular meals, worsening kidney function, memory problems, and illness can all raise the risk.
- Lows can cause falls and other injuries, and severe lows have been linked to a higher risk of dementia.
- Any low that needed help, or repeated lows, should prompt a plan review with your care team. Do not change medicines on your own.
Why Are Older Adults at Higher Risk of Low Blood Sugar?
The American Diabetes Association's Standards of Care in Diabetes—2026, Section 13 says older adults with diabetes have a greater risk of lows, especially when treated with insulin, sulfonylureas, or meglitinides (recommendation 13.4). ADA lists irregular meal intake, especially for people who need insulin, and worsening kidney function among the reasons. Memory and thinking problems can also make complex tasks, such as checking glucose and adjusting insulin, harder.
ADA Section 6 adds other risk factors: older age, having several health conditions, cognitive impairment, chronic kidney disease and kidney failure, heart and blood vessel disease, depression, nerve damage (neuropathy), and slow stomach emptying (gastroparesis).
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says you are more likely to have lows if you take insulin or some other diabetes medicines, are age 65 or older, have had lows before, or have other health problems such as kidney disease, heart disease, or cognitive impairment.
| Risk factor | What the sources say | What you can do |
|---|---|---|
| Insulin, sulfonylureas, or meglitinides | ADA names these as the medicine classes most linked to lows | Ask whether your plan still fits your health and goals |
| Irregular or skipped meals | ADA cites irregular meal intake; NIDDK says skipping or delaying meals can cause lows | Tell your care team if your appetite or meal routine has changed |
| Worsening kidney function | ADA lists it as a reason older adults have more lows | Ask how your kidney results affect your treatment plan |
| Memory or thinking problems | ADA says they can make complex self-care harder | Ask whether your plan can be simpler, and involve a care partner |
| Illness, surgery, or a new medicine | ADA says illness, injury, or surgery can trigger lows, and some antibiotics and antifungals interact with sulfonylureas | Ask for sick-day guidance, and make sure every prescriber knows your full medicine list |
| Alcohol or more activity than usual | NIDDK says both can lower glucose, and activity can lower it for up to 24 hours | Eat when you drink alcohol, and plan ahead for extra activity |
The medicine interaction matters for older adults, who often take several medicines. ADA notes that sulfonylureas interact with some commonly used antimicrobials, including fluoroquinolones, clarithromycin, sulfamethoxazole-trimethoprim, metronidazole, and fluconazole, which can sharply increase their effect and lead to lows. If you take a sulfonylurea and are prescribed one of these, tell the prescriber and pharmacist about all your diabetes medicines. Do not stop or change a medicine on your own.
What Are the Signs of Low Blood Sugar in Older Adults?
NIDDK lists these common symptoms of a low:
- Feeling shaky or jittery
- Hunger
- Tiredness
- Feeling dizzy, lightheaded, confused, or irritable
- A heartbeat that is too fast or not steady
- Headache
- Trouble seeing or speaking clearly
If blood glucose falls very low, NIDDK says the brain may stop working as it should, and a person may lose consciousness or have a seizure.
Older adults may not show or report these signs clearly. ADA Section 6 says older adults are "particularly vulnerable to hypoglycemia because of their reduced ability to recognize hypoglycemic symptoms and effectively communicate their needs." ADA Section 13 adds that knowing the signs of lows is valuable for care partners of people with cognitive impairment, who may not be able to report symptoms.
So new confusion, unusual behavior, or unsteadiness in an older adult with diabetes can be a sign of a low. Check glucose if you can, and follow the person's plan. Low blood sugar and stroke can both cause sudden confusion or trouble speaking. Do not try to sort out the cause at home; call 911 for sudden face drooping, arm weakness, or speech trouble.
Lows can also happen during sleep. NIDDK lists crying out or nightmares, sweating enough to make pajamas or sheets damp, and feeling tired, irritable, or confused after waking as possible signs.
Repeated lows can blunt warning signs, a condition called hypoglycemia unawareness. NIDDK explains that people with it may not notice symptoms until glucose has dropped very low. ADA recommendation 6.11 calls for screening people at risk for impaired awareness at least once a year. A clinician may simply ask, "Can you always feel when your blood glucose is low?" For a fuller list of symptoms, see low blood sugar symptoms.
How Is a Low Treated?
Your own written plan from your care team comes first. As general education:
- Glucose is preferred. ADA recommendation 6.15 says glucose is the preferred treatment for a conscious person with glucose below 70 mg/dL, although any carbohydrate that contains glucose may be used. ADA advises avoiding foods or drinks high in fat or protein for the first treatment.
- Treat, wait, recheck. NIDDK describes taking 15 to 20 grams of glucose or carbohydrates, such as four glucose tablets, one tube of glucose gel, or half a cup of regular fruit juice. Recheck after 15 minutes and repeat if glucose is still low. If the next meal is more than an hour away, NIDDK suggests a snack such as crackers or a piece of fruit.
- Kidney disease changes the juice. NIDDK says people with kidney disease should not use orange juice because it has a lot of potassium. Apple, grape, or cranberry juice are good options.
- Some medicines need glucose tablets or gel. NIDDK says some diabetes medicines slow the digestion of carbohydrates. If you take one, you need glucose tablets or gel, because other carbohydrates will not raise your glucose fast enough.
- Glucagon for severe lows. ADA recommendation 6.16 says glucagon should be prescribed for everyone taking insulin or at high risk of lows, and family and caregivers should know where it is and how to give it. NIDDK says to call 911 right away after giving glucagon.
ADA recommendation 6.17 also says first aid kits should include oral glucose. A household kit near the bed or in the kitchen can make treatment faster.
How Can Older Adults Prevent Lows?
Work through these steps with your care team:
- Know your number. NIDDK says a reading below 70 mg/dL is low for many people with diabetes, but your number may be different. Ask what counts as low for you.
- Ask about a continuous glucose monitor (CGM). ADA recommendation 13.5 recommends a CGM for older adults with type 1 diabetes and for older adults with type 2 diabetes who take insulin. Recommendation 13.6 says automated insulin delivery systems and connected pens can be considered, based on a person's ability and support.
- Keep meals regular. NIDDK suggests an eating plan with enough carbohydrates and carrying a fast-acting source, such as glucose tablets or a juice box.
- Keep supplies ready. The National Institute on Aging (NIA) advises keeping several days' worth of supplies on hand for testing and treating your diabetes in case of an emergency.
- Keep one medicine list. The NIA guide to taking medicines safely as you age suggests listing every medicine and supplement, showing the list to every provider, and using one pharmacy when you can.
- Plan for sick days. ADA says people with diabetes and their caregivers should get specific guidance on preventing, spotting, and treating lows during illness, and on whom to call with questions. See diabetes sick day rules.
- Wear a medical ID. NIDDK recommends a medical alert bracelet or pendant so others know you have diabetes and need care right away.
- Review the plan after changes. NIA notes that a care plan may change after a new diagnosis or after going home from the hospital.
ADA recommendation 13.14a says medicines that can cause lows should be reduced, or switched to a class with a low risk of lows, for older adults at high risk. Recommendation 13.14c says complex plans, especially insulin plans, should be simplified to reduce the risk of lows, the number of medicines, and treatment burden. These are decisions for your care team. Our guide to what A1C should be for older adults explains why goals are often less strict for people at risk of lows.
How Can Care Partners Help?
ADA Section 13 says people with diabetes and their care partners should be asked regularly about any lows, trouble feeling lows, and fear of lows. ADA recommendation 6.20 adds that if thinking is impaired or declining, the clinician, the person with diabetes, and the caregiver should watch more closely for lows.
Care partners can help by:
- Learning the person's warning signs and written low plan.
- Knowing where glucose tablets, gel, and glucagon are kept, and learning how to use the glucagon device if it is prescribed.
- Noticing patterns, such as lows after skipped meals, during illness, or at night, and writing them down for the next visit.
- Going to appointments, with the person's permission, to share what they have seen.
For step-by-step help during a low, see how to help someone with low blood sugar. For everyday support, see how to support someone with diabetes.
Why Do Lows Matter Beyond the Moment?
ADA Section 6 says lows can cause harm, especially if they lead to falls, car crashes, or other injuries. Falls are already common at this age: the Centers for Disease Control and Prevention (CDC) reports that more than one in four older people fall each year, and falling once doubles the chance of falling again. Tell your doctor about any fall, even if you were not hurt.
Thinking and lows are also linked. ADA Section 13 says cognitive decline has been associated with a higher risk of lows, and severe lows have been linked to a higher risk of dementia. These are associations seen in groups of people, not proof that one low causes memory loss. Our guide to whether low blood sugar can cause brain damage covers the research.
Fear of lows matters too. NIDDK notes that worry about lows can lead to high blood glucose if it keeps someone from taking the medicines they need. If fear is shaping how you take your medicines, tell your care team. For the bigger picture of care after 65, see how to manage diabetes in older adults.
When Should You Get Help?
Emergency: Call 911 if someone with diabetes is unconscious, having a seizure, cannot swallow, or is getting worse despite following their low plan. Give nothing by mouth to someone who cannot swallow safely. Call 911 right away after giving glucagon, and for sudden face drooping, arm weakness, or speech trouble. CDC advises that an older person who falls and hits their head should see a doctor right away.
Same day: Contact your care team the same day after any low that needed someone else's help or glucagon, or if lows keep happening. ADA recommendation 6.19 says one or more level 2 or 3 lows (glucose below 54 mg/dL, or a low that needed help) should prompt a review of the treatment plan.
Prompt appointment: Book a visit if you no longer feel the warning signs of lows, have signs of lows during sleep, or notice memory changes. When any new medicine is prescribed, ask the prescriber or pharmacist whether it could affect your blood sugar.
Frequently Asked Questions
What is considered low blood sugar for an older adult?
For many people with diabetes, NIDDK says a reading below 70 mg/dL is low, but your number may be different. ADA 2026 calls glucose below 54 mg/dL a level 2 low that needs immediate action. Ask your care team what counts as low for you and what to do about it.
Why do older adults get low blood sugar more often?
ADA 2026 points to medicines such as insulin, sulfonylureas, and meglitinides, irregular meals, worsening kidney function, and memory or thinking problems. NIDDK also lists age 65 or older, past lows, and health problems such as kidney disease, heart disease, or cognitive impairment as risk factors.
What are the signs of low blood sugar in elderly people?
NIDDK lists shakiness, hunger, tiredness, dizziness, confusion, irritability, a fast or unsteady heartbeat, headache, and trouble seeing or speaking clearly. ADA 2026 notes that older adults may be less able to recognize these symptoms or tell others, so new confusion or unsteadiness can be a sign of a low.
Can low blood sugar cause falls in older adults?
Yes. ADA 2026 says low blood sugar can cause falls, car crashes, and other injuries. CDC reports that more than one in four older people fall each year, and falling once doubles the chance of falling again. Tell your doctor about any fall, even if you were not hurt.
What should you give an older adult with low blood sugar?
If the person is awake and can swallow safely, follow their low plan. NIDDK lists glucose tablets, glucose gel, or half a cup of regular fruit juice as examples and says to recheck after 15 minutes. People with kidney disease should avoid orange juice. If the person cannot swallow, give nothing by mouth and call 911.
Should diabetes medicines be reduced if an older adult has lows?
Sometimes. ADA 2026 says medicines that can cause lows should be reduced or switched for older adults at high risk, and that any low below 54 mg/dL, or any low that needed help, should prompt a review of the treatment plan. These decisions belong to the care team. Do not stop or change a medicine on your own.
References
- American Diabetes Association Professional Practice Committee for Diabetes. “13. Older Adults: Standards of Care in Diabetes—2026.” Diabetes Care. 2026;49(Suppl. 1):S277–S296. Accessed October 2026.
- American Diabetes Association Professional Practice Committee for Diabetes. “6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes—2026.” Diabetes Care. 2026;49(Suppl. 1):S132–S149. Accessed October 2026.
- National Institute of Diabetes and Digestive and Kidney Diseases. “Low Blood Glucose (Hypoglycemia).” Accessed October 2026.
- National Institute on Aging. “Diabetes in Older People.” Accessed October 2026.
- National Institute on Aging. “Taking Medicines Safely as You Age.” Accessed October 2026.
- Centers for Disease Control and Prevention. “Facts About Older Adult Falls.” Accessed October 2026.
- MedicAlert Foundation. “Marion Collins: Creator of MedicAlert Foundation.” Historical context only for the companion feature. Accessed October 2026.
Next Steps
Review your low plan with your care team: what counts as low for you, what to take, whether you need glucagon, and who around you knows how to help. Bring a list of any recent lows and every medicine you take.
For adults with type 2 diabetes or prediabetes who want lifestyle education alongside clinical care, the Done With Diabetes™ program offers a holistic approach to type 2 diabetes that organizes learning about meals, movement, sleep, and stress. It does not diagnose or treat diabetes or low blood sugar, interpret symptoms or test results, change medicines, or replace your care team.