What Should a Diabetes Sick-Day Plan Include?

Illness can make the usual routine unreliable. Appetite may fall, fluids may be hard to tolerate, and the body’s illness response can push glucose higher anyway. The useful response is not guesswork; it is a small, written process that separates ordinary sick-day monitoring from symptoms that need a clinician or emergency department.

What should I do with my diabetes medication when I have vomiting or diarrhea?

Do not stop insulin or other diabetes medicines on your own; the CDC’s 2024 advice is to continue them unless a clinician gives different instructions, while medication-specific exceptions should come from the person’s care plan. This distinction matters because not eating does not necessarily mean glucose will fall. Illness itself can raise glucose.

The American Diabetes Association is equally direct: continue insulin as directed and do not stop it unless a doctor instructs otherwise. Too little insulin can lead the body to break down fat and produce ketones, increasing the risk of diabetic ketoacidosis, or DKA. Skipping insulin is not a neutral choice during illness.

There is an important medication-safety detail for some people with type 2 diabetes. The My Diabetes My Way Scotland NHS guidance says that people taking metformin or an SGLT2 inhibitor who have vomiting or diarrhea may need to pause those medicines until they are eating and drinking normally again; people with kidney problems may need testing before restarting. That is precisely why a pre-arranged plan from the prescribing clinician is more useful than a blanket internet rule.

Keep the plan close to the meter or continuous glucose monitor: current medicines, the clinician’s contact details, ketone-testing supplies, and the personal instructions for corrections or temporary changes. The American Diabetes Association recommends deciding these details with the care team before illness arrives. Boring preparation is valuable here. It removes decisions from the moment when someone feels worst.

How often should I check my blood sugar when I am sick?

The CDC’s 2024 sick-day guidance says to check blood sugar every 4 hours while sick and keep track of the results. The CDC’s 2024 DKA guidance gives a range of every 4 to 6 hours for a person who is sick or whose glucose is at least 250 mg/dL. The practical point is consistency: a single reading is a snapshot, while a written sequence shows whether the situation is stabilizing or moving in the wrong direction.

Record the reading, the time, whether food or fluids stayed down, any ketone result, and symptoms such as vomiting, diarrhea, fever, unusual fatigue, stomach pain, or breathing changes. This is not busywork. It gives a clinician a clearer picture than “my sugar has been high,” and it can make a call for help faster and safer.

Hydration belongs beside the monitoring record. The CDC’s 2024 guidance says to drink plenty of water to prevent dehydration. If meals cannot be eaten, the same source advises about 50 grams of carbohydrate every 4 hours, with examples including unsweetened applesauce or fruit juice. That is a framework for maintaining carbohydrate intake when regular food is not workable, not a substitute for an individualized plan.

For related nutrition context outside an acute illness, see What Is a Realistic Diet for Better Memory and Brain Health?. A sick-day plan is different: it prioritizes short-term safety, hydration, monitoring, and timely medical assessment.

When should a person with diabetes check for ketones?

A person with diabetes should check ketones when sick or when glucose is at least 250 mg/dL, according to the CDC’s 2024 DKA guidance; the American Diabetes Association also identifies dehydration, fasting, nausea, vomiting, fatigue, and glucose at or above 250 mg/dL for 2 or more hours as reasons to test. Ketone testing is not an optional extra when warning signs appear. It helps distinguish a frustrating high reading from a potentially dangerous metabolic problem.

The American Diabetes Association describes a blood ketone meter as the most accurate testing method, with urine strips as another option. If ketones are elevated, its guidance says to continue insulin as directed, drink water or sugar-free fluids, use correction insulin only when it is part of the individual plan, and recheck ketones in 2 to 4 hours. The key limitation is obvious: a generic article cannot safely supply a personal correction regimen.

Urgency rises with symptoms, not merely a number. The CDC’s 2024 DKA guidance lists fast or deep breathing, dry mouth or skin, fruity-smelling breath, severe fatigue, nausea, vomiting, and stomach pain among worsening DKA symptoms. The American Diabetes Association also lists confusion and heavy breathing as reasons for emergency care when ketones are high or worsening.

The decision rule is deliberately conservative. The CDC’s 2024 sick-day guidance says to go to the emergency room for urine ketones, trouble breathing, inability to keep liquids down for more than 4 hours, inability to keep food down for more than 24 hours, vomiting or severe diarrhea for more than 6 hours, a temperature above 101 F for 24 hours, or blood glucose below 60 mg/dL. The CDC’s 2024 DKA page additionally identifies persistent glucose at or above 300 mg/dL, fruity breath, vomiting that prevents keeping food or drink down, breathing trouble, or multiple DKA symptoms as reasons to call 911 or go to the emergency room.

A good sick-day plan ends with a simple process: monitor on schedule, write down glucose and ketones, keep fluids going when possible, follow the personal medication instructions, and escalate early when the red flags appear. Nobody can forecast how an illness will affect a particular person’s glucose. A clear record and a clear threshold for getting help are the useful safeguards.