Most people go looking for diabetes symptoms after a relative is diagnosed, a routine report comes back with a high number, or something feels off: more thirst, more trips to the toilet at night, a cut that will not heal. This page explains which signs matter, which are easy to miss and which need care today.
For what diabetes is and how it is treated, read our diabetes guide covering symptoms, tests and treatment.
One fact shapes everything below: symptoms cannot diagnose diabetes, and their absence does not rule it out. The Indian Council of Medical Research (ICMR) notes that type 2 diabetes appears at least a decade earlier in Indians than in other major ethnic groups, often with no complaints at all. A blood test is the only way to know.
Common diabetes symptoms and why they happen
When blood glucose stays high, the kidneys try to clear the extra sugar through urine and take water with it. That one process explains several of the classic symptoms. The World Health Organization (WHO), American Diabetes Association (ADA) and ICMR describe the same core list:
- Passing urine often, especially getting up at night to urinate.
- Unusual thirst and a dry mouth, as the body tries to replace the water lost in urine.
- Tiredness that does not match your sleep or workload, because glucose is not reaching cells efficiently.
- Unexplained weight loss or feeling hungry soon after eating, more typical when sugar is very high or in type 1 diabetes.
- Blurred vision, which happens when high sugar changes the fluid in the lens of the eye. It often settles once sugar comes down.
- Slow-healing cuts and repeated infections, such as urine infections, boils or itching and fungal infection around the genitals.
- Tingling, burning or numbness in the feet, a sign that nerves may already be affected.
None of these is specific. Thirst rises in hot weather, frequent urination can be a urine infection or an enlarged prostate, and tiredness has dozens of causes, including anaemia and thyroid disease. What matters is a new pattern, several signs together, or any of them alongside a risk factor such as a family history of diabetes.
Early signs of diabetes that are easy to miss
Type 2 diabetes usually builds slowly. Blood sugar can sit in the prediabetes range, and then in the diabetes range, for years before anything feels wrong. These quieter clues are often noticed only in hindsight:
- Infections that keep coming back: a second or third urine infection in a year, recurring vaginal thrush, or skin infections that need repeated creams.
- Dark, velvety skin on the back of the neck, armpits or groin. This is called acanthosis nigricans and is a sign of insulin resistance rather than diabetes itself. ICMR lists it as a reason to test earlier. Read more in our guide to dark patches on the neck.
- Changes in the feet: pins and needles, burning at night, or not feeling a stone in your chappal. Our guide to diabetes and your feet explains what to check.
- Feeling drained after large meals, or needing a sweet or a nap every afternoon. This is common in people without diabetes too, so treat it as a reason to test, not as proof.
- A result flagged during another check-up, such as a high fasting sugar in a pre-surgery test or a high reading in pregnancy.
The most common early sign is no sign at all. That is why ICMR's 2018 guideline recommends screening everyone over 30, and earlier if you have risk factors such as a family history, a waist over 90 cm for men or 80 cm for women, high blood pressure, past gestational diabetes or polycystic ovary syndrome (PCOS). Research Society for the Study of Diabetes in India (RSSDI) goes further and recommends a yearly risk check from age 25.
How the signs can differ by person
In women
Repeated vaginal thrush or urine infections are often the first clue. Irregular periods and PCOS, and a history of gestational diabetes, raise the risk of type 2 diabetes later. Our guide for women with diabetes risk covers this in detail.
In men
Erection problems can be an early sign of the nerve and blood-vessel changes that high sugar causes, sometimes years before diagnosis. Repeated infection or itching of the foreskin is another clue. Both are reasons to get a sugar test rather than to buy a tablet.
In children and young adults
Type 1 diabetes tends to appear quickly, over days or weeks: heavy thirst, a child who starts wetting the bed again, weight loss despite eating well, and tiredness. It can progress to an emergency, so a child with these symptoms needs a same-day check. Type 2 diabetes is also rising in young Indians with excess weight or a strong family history.
In older adults
Older people may not feel thirsty even when sugar is high, so the first signs can be tiredness, confusion, falls, weight loss or infections. Dehydration happens faster at this age.
Type 1 and type 2 diabetes: how the symptoms differ
| Feature | Type 1 diabetes | Type 2 diabetes |
|---|---|---|
| How fast symptoms appear | Over days to weeks | Over months to years, often none at all |
| Typical age | Often children and young adults, but any age | Usually adults; in India often from the 30s, sometimes earlier |
| Weight | Weight loss is common | Often linked with weight around the waist, but can occur at a normal weight |
| First sign can be an emergency | Yes, diabetic ketoacidosis | Less often |
| Treatment | Insulin is always needed | Lifestyle, tablets, injections or insulin, depending on the person |
The two can be hard to tell apart in young adults, and some people have other types. The treating doctor decides the type, sometimes with antibody or C-peptide tests.
Emergency symptoms of very high and very low sugar
Very high sugar
Very high sugar can lead to diabetic ketoacidosis or a hyperosmolar state. The National Health Service (NHS) and ADA list these warning signs: vomiting, stomach pain, deep or fast breathing, breath that smells fruity, severe thirst and dehydration, drowsiness or confusion. These need emergency care, not a wait-and-see approach. Call 112 or go to the nearest hospital.
Very low sugar
Low sugar mostly affects people already taking insulin or sulfonylurea tablets. ADA defines it as a reading below 70 mg/dL. Signs include shaking, sweating, sudden hunger, a racing heart, dizziness and confusion. If someone is drowsy, cannot swallow safely, has a fit or is unconscious, it is an emergency.
Which test confirms diabetes
Diabetes is diagnosed with a laboratory blood test, not with symptoms, urine sugar strips or a single home glucometer reading. ADA, ICMR and WHO agree on these diabetes thresholds:
| Test | Diabetes | Prediabetes range | Notes |
|---|---|---|---|
| Glycated haemoglobin (HbA1c) | 6.5% or higher | 5.7–6.4% | No fasting needed; anaemia and some haemoglobin variants can make it misleading |
| Fasting plasma glucose | 126 mg/dL or higher | 100–125 mg/dL (ADA) or 110–125 mg/dL (WHO and ICMR) | After at least 8 hours without food |
| 2-hour oral glucose tolerance test | 200 mg/dL or higher | 140–199 mg/dL | Measured 2 hours after a 75 g glucose drink |
| Random plasma glucose | 200 mg/dL or higher with classic symptoms | Not used | Without symptoms, it is not enough on its own |
Unless you have clear symptoms with very high sugar, an abnormal result is usually confirmed with a repeat test or a second type of test. If your numbers fall in the middle column, read our guide to prediabetes and how to stop it turning into diabetes.
A home glucometer is useful for monitoring once you have a diagnosis and a plan. It is not designed to diagnose diabetes, and one high reading after a festive meal does not mean you have it.
When to see a doctor
Our diabetes guide has the full list of warning signs.
Emergency: get help now
- Vomiting, stomach pain, deep or fast breathing, fruity breath, confusion or marked drowsiness, especially with a high reading.
- Suspected low sugar with drowsiness, confusion, a fit or unconsciousness.
Prompt review: within a day or two
- A child or young adult with heavy thirst, bedwetting and weight loss.
- Rapidly worsening thirst and urination, quick unexplained weight loss, a foot wound that is not healing, or a sudden change in vision.
Routine review: book a test
- You have one or more of the common symptoms, even if mild.
- You are over 30, or younger with a risk factor such as a family history, a large waist, high blood pressure, PCOS or past gestational diabetes, and have not been tested recently.
Not sure who to see? Our guide to which doctor to see for diabetes explains when a general physician is enough and when to see a diabetologist.
How Disha can help
Disha is an AI health coach that chats and calls in Hindi, English and Hinglish. After an onboarding call of about 15–20 minutes, conducted by Disha itself, it can help you turn a new diabetes or prediabetes result into daily food, movement and sleep habits, and remind you about follow-up tests your doctor has asked for. Disha does not diagnose, prescribe, change medicine doses or provide emergency care, and it does not replace your doctor. Read how Disha coaching works.
This is not medical advice. This page is general information for adults. Symptoms alone cannot diagnose or rule out diabetes; only a laboratory test can. If you are pregnant, have a child with symptoms, or already take diabetes medicine, speak to your doctor. In an emergency, call 112.
Frequently asked questions
What are the first signs of diabetes?
The most common first signs are thirst, passing urine often, especially at night, and tiredness. Others are blurred vision, slow-healing cuts, repeated urine or genital infections and tingling feet. Many people with type 2 diabetes notice nothing at first, so a blood test, not the absence of symptoms, is what tells you whether you have it.
Can you have diabetes without symptoms?
Yes, and it is common. Type 2 diabetes can stay silent for years while sugar slowly rises. That is why ICMR recommends screening all adults over 30, and earlier if you have a family history, a large waist, high blood pressure, PCOS or past gestational diabetes. A fasting glucose or HbA1c test is a simple place to start.
Sugar ke kya lakshan hote hain? Is frequent urination always diabetes?
No. Frequent urination is one of the classic sugar symptoms, but a urine infection, an enlarged prostate in men, pregnancy, drinking a lot of tea or water, and some medicines can cause it too. If it is new, happens at night, or comes with thirst, tiredness or weight loss, get a blood sugar test to check.
What sugar level means diabetes?
On a laboratory test, a fasting plasma glucose of 126 mg/dL or more, an HbA1c of 6.5% or more, or a 2-hour glucose tolerance result of 200 mg/dL or more indicates diabetes. A random glucose of 200 mg/dL or more counts only with classic symptoms. An abnormal result is usually confirmed with a repeat test before diagnosis.
Can a glucometer at home tell me if I have diabetes?
No. A home meter shows your capillary sugar at one moment and is useful for monitoring once you have a diagnosis. It is not a diagnostic test, and strips, technique and recent food all change the reading. If a home reading worries you, book a laboratory fasting glucose or HbA1c test and take the result to a doctor.
Do the symptoms differ in type 1 and type 2 diabetes?
The symptoms are similar, but the speed differs. Type 1 diabetes usually comes on over days or weeks with heavy thirst, weight loss and tiredness, and can quickly become an emergency. Type 2 diabetes develops slowly and often causes no symptoms for years. A doctor confirms the type, sometimes with extra blood tests.
Which symptoms of diabetes need emergency care?
Get emergency help for vomiting, stomach pain, deep or fast breathing, fruity-smelling breath, severe dehydration, drowsiness or confusion, especially with a high reading. In someone on insulin or sulfonylurea tablets, a fit, unconsciousness or confusion may mean very low sugar. Call 112 or go to the nearest hospital without waiting.
Sources
- American Diabetes Association Professional Practice Committee. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes—2026. 2026. Supports: diabetes and prediabetes thresholds for HbA1c, fasting glucose and the 2-hour glucose tolerance test; random glucose with classic symptoms; confirmation of abnormal results; acanthosis nigricans as a sign of insulin resistance.
- Indian Council of Medical Research. ICMR Guidelines for Management of Type 2 Diabetes. 2018. Supports: type 2 diabetes at least a decade earlier in Indians; screening all adults over 30 and earlier with risk factors including waist over 90 cm and 80 cm, PCOS and acanthosis nigricans; WHO and ADA prediabetes ranges; symptoms of neuropathy.
- Research Society for the Study of Diabetes in India. RSSDI Clinical Practice Recommendations for the Management of Type 2 Diabetes Mellitus 2022. 2022. Supports: annual diabetes-risk evaluation from age 25 in India.
- World Health Organization. Diabetes fact sheet. 2024. Supports: common symptoms such as thirst, frequent urination, blurred vision, tiredness and unexplained weight loss; type 1 diabetes requiring insulin.
- NHS. Symptoms of type 2 diabetes. Current page. Supports: urinating more often, especially at night, thirst, tiredness, weight loss, itching around the genitals or repeated thrush, slow-healing cuts and blurred vision; many people having no symptoms.
- NHS. Diabetic ketoacidosis. Current page. Supports: vomiting, stomach pain, deep breathing, fruity breath, drowsiness and confusion as emergency warning signs.
- American Diabetes Association Professional Practice Committee. 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes—2026. 2026. Supports: low blood glucose defined as below 70 mg/dL; symptoms and higher risk with insulin and sulfonylureas; hyperglycaemic crises.
- American Diabetes Association Professional Practice Committee. 12. Retinopathy, Neuropathy, and Foot Care: Standards of Care in Diabetes—2026. 2026. Supports: tingling, burning and numbness in the feet as signs of nerve damage; erectile dysfunction as a feature of autonomic neuropathy.
Related reads
- Diabetes: symptoms, tests, treatment and Indian food: the full overview of diagnosis, treatment and red flags.
- Prediabetes: numbers, signs and how to prevent diabetes: what to do if your result falls between normal and diabetes.
- Diabetes symptoms in women: infections, periods, PCOS and pregnancy.
- Early signs of diabetes in the feet: what to check every day.
- Dark patches on the neck and insulin resistance: when a skin change is a reason to test.
- All diabetes articles: every Disha guide on diabetes in one place.
- BMI calculator with Indian cut-offs: one screening measure that does not capture waist or individual health.
