Sick on a Trip with Type 1 Diabetes: The Sick-Day Travel Playbook (2026)

Getting sick at home with type 1 diabetes is a managed problem: your pharmacy is five minutes away, your care team knows your name, and your kitchen has exactly the foods you tolerate. Getting sick on a trip is a different animal. The pharmacy is in a language you do not speak, your care team is asleep in another time zone, and the hotel minibar is not a sick-day plan.

Fall and winter are when this matters most, and holiday travel stacks the risk: packed flights, recycled cabin air, and the stress of disrupted routines. This playbook has three parts: what to pack before you leave, the testing rules and red flags that official guidance agrees on, and how to get help away from home. One boundary up front: dosing decisions live with your care team, never with this page. Ask them for your personal sick-day plan before you travel; everything below is the logistics and the warning signs around that plan.

Before you travel: the sick-day kit

Most travelers pack for the trip they planned. The sick-day kit is the second, smaller kit for the trip nobody plans. It rides inside your carry-on, never in checked luggage, and it exists so a fever at 11pm in a foreign city does not become a pharmacy scavenger hunt.

• Ketone test strips. Blood ketone strips with a matching meter, or urine ketone strips. Either works; blood ketone meters are faster and more accurate. Check the expiration dates before you pack, and confirm the strips work with the meter you are carrying.
• Backup insulin delivery. If you pump, pack backup pens or syringes plus your pump's backup supplies. If a site fails while you are sick, the last thing you need is a second emergency.
• Glucagon. Nasal glucagon stores at room temperature up to 86F (30C), so it travels fine in the day bag. Brief your travel companion on where it is and how it works before you need it.
• Care-team on-call number, saved offline. Your endocrinologist's after-hours line and your pharmacy's number belong in your phone and on a paper card, not only in an email you need wifi to open.
• Travel insurance card. Declare your type 1 diabetes on the policy, and know whether it pays the hospital directly or reimburses you later.
• Fast-acting carbs at the bedside. Sugar packets travel better than juice boxes: 1 packet at 60 to 70 mg/dL, 2 below 60.
• Water and bland carbs. Broth, plain crackers, toast, bananas, applesauce, and regular (not sugar-free) juice for low or dropping glucose. About 15 grams of carbs per swap is the usual hospital figure: a slice of toast, half a cup of juice, six saltines, or half a cup of applesauce.
• Thermometer. A fever changes the math on everything below, and guessing your temperature in a hotel room is not a plan.

Pack the kit with the 20% buffer rule applied to the insulin and supplies it touches: pack 20% more than the trip math says, and split it so one lost bag is never all of your supplies.

The non-negotiables: what the official guidance agrees on

Hospital and diabetes-organization guidance on sick days is remarkably consistent across countries. These are the rules that do not change:

• Never stop taking insulin. Insulin treatment should never be stopped during illness, even if you are not eating. Background (long-acting) insulin continues no matter what. Illness usually makes the body need more insulin, not less; how much more is a care-team decision, and it should be decided before the trip, not during the fever.
• Test more often than usual. Check glucose and ketones every 2 to 4 hours while sick, and more often if numbers are moving. The official thresholds agree: start ketone testing during any illness, when glucose stays above about 13.9 mmol/L (250 mg/dL), or with nausea or vomiting.
• Keep fluids going. Sip fluids constantly to fight dehydration: hospital guidance lands around 125 to 180 ml (about half to three-quarters of a cup) every half hour while you are awake. Water and sugar-free fluids when glucose is high; regular fluids with carbs when glucose is low or dropping.
• Eat a little if you can. The goal is not nutrition, it is a steady trickle of carbs. If you cannot keep food down, focus on fluids and call your care team.
• Never ration insulin to stretch a dwindling supply. Rationing while sick is how a bad day becomes diabetic ketoacidosis (DKA, the emergency where ketones build up in the blood because the body cannot use glucose). If supplies are running out, that is a supply emergency, not a dosing decision: use the recovery call order in the supplies recovery playbook instead.

Ketones: the numbers and what they mean on a trip

Ketones are what your body makes when it burns fat for fuel because it cannot get glucose into its cells. A few are normal. A lot, combined with high glucose, is the early stage of DKA, which is a genuine emergency. Hospital guidance reads the numbers like this:

• Below 0.6 mmol/L. Acceptable. Keep following the rules above and retest in 2 to 4 hours.
• 0.6 to 1.5 mmol/L. The body is short on insulin. Drink more fluids, follow your care team's sick-day dosing plan, and retest in 1 to 2 hours.
• Above 1.5 mmol/L. Risk of diabetic ketoacidosis. Seek medical help straight away.

Ketones can show up even when your glucose looks fine, especially with illness or vomiting, so do not skip the ketone check just because the CGM (continuous glucose monitor) number looks reasonable.

The red flags: when a hotel room becomes an emergency

This is the part that ends the guesswork. DKA is treated with IV fluids and insulin in a clinical setting; it cannot be waited out in a hotel room. Go to urgent care or the emergency department if any of these show up:

• You cannot keep fluids down, or vomiting continues.
• Ketones are moderate or large and rising, or your glucose stays stuck high.
• A fruity or sweet smell on your breath.
• Fast, deep, or difficult breathing, or a racing heart.
• Stomach pain, extreme thirst, severe tiredness, or confusion.
• A fever above 101F (38.3C), or any fever lasting more than two days.

Do not drive yourself. Call the hotel front desk, a ride service, or local emergency services. This is exactly the scenario travel insurance exists for: emergency care with diabetes declared on the policy. The full insurance checklist lives in the travel insurance guide.

Getting help away from home

The recovery call order from the supplies recovery playbook works for sick days too, with the urgency turned up:

1. Your care team's on-call line. First call, always. They know your doses, your devices, and your sick-day plan.
2. The hotel front desk or concierge. They know the nearest urgent care clinic and can arrange transport. Do not be shy about this; it is a routine request.
3. A local pharmacy. Pharmacists are the unsung heroes of travel emergencies. In the US, some insulins can be purchased over the counter in urgent situations, and abroad a pharmacist can often dispense emergency supplies or point you to the nearest clinic.
4. Your travel insurance. The card in your kit has a 24-hour assistance number. Use it for emergency care, and keep every receipt.
5. Telehealth. A video visit can bridge the gap when your own care team is unreachable across time zones.

If you get sick on the plane

Tell a flight attendant early, not when you are already in trouble: crews are trained for medical situations and can arrange help on landing. Sip water, keep your devices on, and keep sugar packets in the seat pocket, not the overhead bin. If nausea starts, the sick-day rules start too: test glucose and ketones, keep fluids going, and never skip insulin. The cabin is a bad place to ration anything.

The sick-day travel checklist

1. Ketone strips (and a working meter) packed in the carry-on, expiration dates checked.
2. Backup insulin delivery: pens or syringes alongside pump supplies, with the 20% buffer.
3. Care-team on-call number saved offline, plus the pharmacy number.
4. Travel insurance card in the kit, diabetes declared on the policy.
5. Glucagon in the day bag; your companion knows where it is.
6. Fast carbs at the bedside: sugar packets, 1 at 60 to 70, 2 below 60.
7. While sick: glucose and ketones every 2 to 4 hours, fluids constantly, insulin never stopped.
8. Red flags memorized: cannot keep fluids down, rising ketones, fruity breath, fast breathing, stomach pain, confusion. Any one of them means urgent care, not waiting it out.

Frequently Asked Questions