Track Diabetes and Blood Sugar: How You Feel, Next to the Numbers

What to track with diabetes and blood sugar problems

Choosing Diabetes and Blood Sugar in Trace Health switches these on, the most closely linked first. Log them when they happen; quiet days are part of the record too.

• Low Blood Sugar is the hypo itself, graded the way clinicians grade it: mild if you felt shaky, sweaty or hungry and treated it yourself, moderate if you were confused, weak or struggling to act, severe if you needed someone's help or glucagon, or passed out. Mark it Gone once you recover, so each hypo has a length.
• Increased Thirst is the clearest felt sign of glucose running high, and distinct from a dry mouth.
• Fatigue follows both highs and lows, and often lingers for hours after a hypo.
• Frequent Urination, especially at night, travels with thirst when glucose spills into the urine.
• Shakiness & Tremor is often the first adrenaline warning of a low.
• Vision Changes such as blurring can come with highs and settle as glucose steadies. Retinopathy itself is usually silent, which is why eye screening matters.
• Numbness / Tingling and Nerve Pain in the feet or hands are early signs of neuropathy, often worse at night, and worth raising at your foot check.
• Brain Fog and Irritability come with lows and long highs, and are often what other people notice first.
• Night Sweats, with nightmares or a morning headache, can be the only sign of a hypo during sleep.

The daily factors that move your blood sugar

Glucose responds to almost everything you do. Log these in one tap on the days they happen, and Insights show which ones line up with your symptoms.

• High-Carb Meal marks a meal built on bread, pasta, rice or potatoes, the biggest single driver of the post-meal rise and the usual setting for a reactive low two to four hours later. No grams, just the meal.
• Sugar covers sweets and sugary drinks, absorbed fastest of all. It is also what you treat a hypo with, so a note tells the two apart.
• Skipped Meal is a classic hypo trigger with insulin or a sulfonylurea, because the dose keeps working when the food never arrives.
• Daily Medications covers metformin, gliclazide, SGLT2 inhibitors and the rest; dated starts and changes show what each did.
• Injection / Infusion covers insulin, weekly GLP-1 injections and pump set changes. Using the same spot causes lumpy areas that absorb insulin unpredictably, so note the site if lows and highs seem random.
• Alcohol slows the liver's release of glucose while it clears the drink, so hypo risk lasts into the night and the next morning.
• Walking / Hiking and Physical Activity lower glucose during and for up to 24 hours after, behind many night lows. A short walk after eating also flattens the post-meal rise.
• Stress releases cortisol and adrenaline, which push glucose up and make it less predictable.
• Poor Sleep reduces insulin sensitivity the next day, after even one short night in studies.

Hypos, highs and what a glucose number leaves out

A meter or CGM answers one question very well: what is my glucose now. It cannot say how a reading felt, why it happened or what it cost you. A low of 3.5 mmol/L (63 mg/dL) can be a slight wobble at your desk or a frightening moment at the wheel, and the number looks the same. That is why the American Diabetes Association grades hypos by what they did as well as by the reading: level 3 is any low where you needed someone else's help. The severity of Low Blood Sugar in Trace Health follows the same logic.

Highs are felt differently. Above about 10 mmol/L (180 mg/dL), glucose spills into the urine, so thirst, frequent urination and fatigue are what a run of highs feels like. Logged next to high-carb meals, stress and illness, they show where highs sit in the shape of your day, not only on a graph.

Patterns matter for safety too. Fewer mild hypos but more moderate or severe ones can mean your warning signs are fading, called impaired hypo awareness, which your team will want to know about. Lows the night after a long walk or a few drinks are a timing problem with a fix.

What Trace does not do: it does not read or display glucose, ketones, HbA1c or insulin doses, count carbohydrates, calculate doses or raise alarms. Keep your meter, CGM and pump apps for that. Trace adds the context they lack, and you bring both to your review.

Preparing for your diabetes review or annual check

Most people with diabetes see their team every three to six months, with a fuller annual review: HbA1c, blood pressure, cholesterol, kidney function, a foot check and eye screening, close to what Diabetes UK lists as the essential yearly checks. Appointments are short and mostly about numbers. How often hypos happen and how you feel is what only you can add.

Bring three things. Your glucose data, downloaded or shared from your meter, CGM or pump as your clinic asks, since time in range and time below range are now central measures. A short list of questions. And the doctor-ready PDF from Trace Health for the period since your last review: how many hypos you had and how severe, at what time of day, what came before them, and how fatigue, thirst, tingling or nerve pain have moved.

That record makes specific questions possible. Are my night lows linked to evening exercise? Are my hypos after skipped lunches a sign my tablets are now too strong since I lost weight? Has the burning in my feet changed since my last foot check? Did my thirst ease after starting a new medicine? Mention any vision changes even if your last screening was clear, and any numbness, cut or color change on your feet, because foot problems caught early are far easier to treat. Trace Health does not diagnose or suggest treatment changes. It makes sure the conversation starts from what actually happened.

Frequently asked questions

Can Trace Health log my glucose or insulin?

No. Trace Health is a symptom and lifestyle diary, not a glucose logger, CGM app, insulin dose calculator or carb counter. It does not read, store or display glucose, ketones, HbA1c, insulin doses or carbohydrate grams, and it does not raise alarms. Keep using your meter, CGM, pump or pen app for those. What Trace records is the part those apps leave out: hypos graded by how they affected you, thirst, fatigue, tingling and other symptoms, and one-tap entries for high-carb meals, skipped meals, walks, alcohol, stress, sleep, medication and injections. Bring both records to your review: the numbers show what your glucose did, the diary shows what you felt and what came before.

Is tracking different for type 1 and type 2 diabetes?

The trackers are the same, but the emphasis differs. In type 1 diabetes, an autoimmune condition in which the pancreas makes little or no insulin, every meal, walk and dose interacts, so hypos and their triggers, night lows after exercise or alcohol, and the thirst and tiredness of highs are usually the core of the log. In type 2, where the body makes insulin but responds to it poorly, hypos matter mainly if you take insulin or a sulfonylurea; otherwise the focus is often fatigue, thirst, how meals and activity affect you, and early nerve or eye symptoms. In prediabetes and insulin resistance, logging high-carb meals, walks and sleep next to your energy shows what helps. Your care team decides treatment; the log gives them the context.

I get shaky a few hours after meals but do not have diabetes. Is that worth tracking?

Yes, and worth showing to a doctor. Shakiness, sweating, hunger, anxiety and difficulty concentrating within about four hours of eating can be reactive (postprandial) hypoglycemia, where the insulin response to a meal overshoots. It is more common after stomach or bariatric surgery and in prediabetes, but similar feelings can also come from anxiety, caffeine, or simply going too long without food. Doctors usually want evidence that glucose was actually low during symptoms and that eating relieved them. Log Low Blood Sugar each time, with High-Carb Meal, Sugar and Skipped Meal on the same timeline, so the timing is clear. Episodes while fasting, or with confusion or fainting, need prompt assessment.

Is my diabetes data private?

Your entries stay on your iPhone. There is no Trace Health account, no email address and no signup, and your logs are not uploaded to Trace Health servers. That matters for diabetes, where a record can touch medication, alcohol, mood and, for some people, questions about driving, work or insurance. Nothing leaves your phone unless you choose to export a doctor-ready PDF, and you decide who receives it, whether that is your diabetes nurse, your GP, an endocrinologist, or nobody at all. Tracking symptoms is free, so you can start building a record well before your next review and see whether it is useful to you.

Diabetes wears me down some weeks. Should I track that too?

Yes. Living with diabetes means many small decisions every day, and many people go through periods of diabetes distress or burnout: feeling overwhelmed, frustrated or guilty about numbers, or tempted to stop checking. It is common, it is different from depression although the two can overlap, and the ADA's standards of care ask clinicians to look for it. Logging Irritability, Fatigue, Brain Fog, Stress and Poor Sleep alongside your hypos shows whether hard weeks follow a run of lows or highs, or come first. Trace Health also asks once a day how you felt overall, in one tap. If you feel low most days for two weeks or more, tell your diabetes team or doctor, because support exists.

Can I log symptoms from my Apple Watch?

Yes. Trace Health has an Apple Watch app: tap a symptom on your wrist the moment it starts, and tap again to change its severity or mark it gone. Complications keep your key symptoms on the watch face, and every log joins the same history, charts and doctor report on your iPhone. It is part of Premium and needs watchOS 11 or later.

Does Trace Health work on iPhone Duo?

Yes. Trace Health is made for iPhone Duo. Folded, you log a symptom with one hand on the cover screen. Open, your symptoms and habits sit side by side, and each symptom page shows its history and insights together.