Medically reviewed: 11 September 2026 · Last updated: 11 September 2026
See the 10 warning signs, who should get tested, and which blood tests give a clear answer
Illustrative example: Suresh, 46, works long hours in a Hyderabad office. For months he has been getting up twice a night to pass urine and feeling drained by mid-afternoon. He blames work stress. Then a routine company health check puts his fasting sugar well inside the diabetic range.
Stories like this can happen when early symptoms are easy to explain away, especially after 40. In India, about 101 million adults have diabetes and another 136 million have prediabetes, according to the ICMR-INDIAB study[1]. Here are the warning signs to watch for and when a blood test is worth doing.
Quick Answer
- The most common early symptoms of diabetes are passing urine more often (especially at night), constant thirst, tiredness, and losing weight without trying.
- Blurred vision, cuts that heal slowly, and genital itching or repeated thrush can also appear.
- More than half of people with diabetes have no symptoms at all, according to ICMR guidelines[2].
- Indians tend to develop type 2 diabetes earlier, so India screens everyone from age 30, and only a blood test can confirm it[2][4].
Early Symptoms of Diabetes: The 10 Warning Signs
High blood sugar changes the body slowly, so most early symptoms of diabetes creep in rather than arrive at once. The ten signs below come from NHS and ICMR lists[2][3]. One sign alone proves nothing. Several together, particularly after 40, is a good reason to get checked.
The Four Most Common Signs
NHS lists these four as the most common symptoms of type 2 diabetes[3].
- 1. Passing urine more often: When sugar builds up in the blood, the kidneys flush the extra into the urine and water goes with it. Many people first notice this at night.
- 2. Thirst that will not go away: Losing that fluid leaves you thirsty, even when you drink plenty.
- 3. Tiredness: Sugar stays in the blood instead of reaching your cells, so they run short of fuel. Thyroid problems cause tiredness too, and our thyroid test normal range chart explains those results.
- 4. Losing weight without trying: When the body cannot use sugar properly, it burns fat and muscle instead. ICMR notes this can happen even while appetite goes up[2].
Other Signs to Watch For
- 5. Blurred vision: High sugar affects the lens of the eye, making things look fuzzy[3].
- 6. Cuts and wounds that heal slowly: A small scrape that lingers for weeks is worth mentioning[2][3].
- 7. Genital itching or repeated thrush: Yeast thrives on extra sugar, in women and men alike[3].
- 8. Urine infections that keep coming back: ICMR lists repeated urinary and genital infections as a symptom[2].
- 9. Feeling hungry soon after eating: ICMR lists extra hunger alongside weight loss[2].
10. A Skin Clue: Dark, Velvety Patches
Some people notice darker, thicker, velvety skin on the back of the neck, in the armpits, or in the groin. Doctors call it acanthosis nigricans, and it most often points to insulin resistance, the problem underneath type 2 diabetes[5]. It signals risk rather than high sugar itself, and ICMR lists it as a reason to screen early[2]. Some medicines cause it too, so let a doctor take a look.
Type 2 Diabetes Symptoms: Why Many People Notice Nothing
Here is the part most lists skip. ICMR's 2018 guidelines state that more than half of people with diabetes have no symptoms at all[2]. WHO says type 2 symptoms can be mild and may take years to notice[6].
So many people find out by chance, at a job medical or before surgery. If you are over 30 and never tested, that gap matters more than any symptom list.
Possible Signs of Longer-Term Diabetes
These findings can appear when diabetes has been present for some time, but they can also have other causes.
- Tingling, burning, or numbness in the feet or hands: ICMR describes these as signs of nerve damage from diabetes[2].
- Eye damage found on a check-up: Diabetes can harm the back of the eye while vision still feels normal, so ICMR advises a dilated eye check at diagnosis[2].
ICMR notes that eye or kidney damage at diagnosis usually means diabetes went undetected for years[2]. If either applies, get tested this week.
Why Indians Get Diabetes Earlier and at a Lower Weight
ICMR describes what doctors call the Asian Indian phenotype. At the same body weight, many Indians carry more body fat, more fat around the organs, and more insulin resistance than white Caucasian people[2]. You can look slim and still be at risk.
Type 2 diabetes also appears at least a decade earlier in Indians than in other major ethnic groups[2], and the NHS flags risk from age 25 for South Asian people[3].
Under 40? Read our guide to type 2 diabetes in young Indians. Normal weight but a strong family history? See prediabetes in normal-weight Indians.
Symptoms of Diabetes in Women
Most diabetes symptoms are the same for everyone, but women have a few extra clues.
- Repeated thrush or urine infections: Vaginal itching and infections that keep returning deserve a sugar test[2][3].
- PCOS: ICMR lists polycystic ovary syndrome as a reason to screen early[2]. Our guide on what PCOS treatment can and cannot do goes deeper.
- Past gestational diabetes: ICMR notes that 50 to 70% of women with gestational diabetes develop diabetes within 5 to 10 years of delivery[2]. Make regular testing routine.
Symptoms of Diabetes in Men
Men get the same core symptoms. One that rarely gets discussed is itching around the penis, which NHS lists as a symptom of type 2 diabetes[3]. It feels awkward to raise, but a quick sugar test settles the question.
When Should You Get Tested?
India's national NCD programme screens everyone aged 30 and above, in line with ICMR's 2018 guidelines[2][4]. Test earlier if any of these apply:
- A parent, brother, or sister with diabetes
- A BMI of 23 or more, or a waist above 90 cm for men or 80 cm for women
- Blood pressure of 130/80 or higher, or high cholesterol
- Little exercise, PCOS, dark skin patches, past gestational diabetes, or heart disease
If your result is normal, ICMR suggests repeating the test every three years. With prediabetes, test once a year[2]. If you already have any of the ten warning signs, get tested now.
Which Blood Tests Confirm Diabetes?
Three tests do most of the work. Fasting blood sugar is taken after an overnight fast. HbA1c reflects your average sugar over roughly three months. The oral glucose tolerance test (OGTT) checks sugar before and 2 hours after a 75 g glucose drink, and ICMR calls it the test of choice[2].
A single high result is not the final word. ICMR says diabetes should be confirmed with a repeat test on a different day, unless sugar is clearly very high[2].
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| Fasting blood sugar | Below 100 (ADA) or below 110 (WHO) | 100 to 125 (ADA) or 110 to 125 (WHO) | 126 or higher |
| 2 hours after 75 g glucose (OGTT) | Below 140 | 140 to 199 | 200 or higher |
| HbA1c | Below 5.7% | 5.7% to 6.4% | 6.5% or higher |
| Random blood sugar | Not used to label normal | 140 to 199 needs an OGTT | 200 or higher, with symptoms |
Glucose values in mg/dL, HbA1c in percent. Source: ICMR Guidelines for Management of Type 2 Diabetes 2018, Table 3.1[2].
Why two fasting numbers? WHO and the American Diabetes Association draw the prediabetes line differently, and ICMR lists both[2]. For more detail, see our normal blood sugar levels chart by age and our HbA1c normal range chart.
What to Do If Your Result Is High
Take a breath, then take the report to your doctor before trying any remedy.
- Expect a repeat test to confirm the result, as ICMR advises[2].
- If it shows prediabetes, lifestyle change comes first, and ICMR notes diabetes can be prevented in up to a third of people at this stage[2]. Our guide on how long it takes to reverse prediabetes sets realistic expectations.
- If diabetes is confirmed, your doctor will plan treatment around your sugar, weight, kidneys, and heart. Most people need medicine alongside lifestyle changes[2], and our overview of GLP-1 drugs in India covers one newer option.
When to Get Urgent Medical Help
When to Call for Help Now
Very high sugar can turn into an emergency. Call 112 or 108, or go to the nearest hospital, if you or someone with you has:
- Vomiting, stomach pain, or deep, fast breathing
- Breath that smells fruity, like nail polish remover
- Confusion, severe drowsiness, or fainting
- Extreme thirst and dehydration with a very high sugar reading
These can signal diabetic ketoacidosis or hyperosmolar hyperglycaemic state, both emergencies, even before diabetes is diagnosed[2][7]. Do not drive yourself.
Key Takeaways
- Night-time urination, thirst, tiredness, and weight loss deserve a blood test, not a guess.
- Feeling fine proves nothing about your sugar. In India, screening starts at 30.
- A slim build does not rule you out.
- Confirm any high result with a repeat test.
- Numbness, eye changes, or emergency signs mean act today.
Frequently Asked Questions
What are the 10 warning signs of diabetes?
Passing urine more often, constant thirst, tiredness, weight loss without trying, blurred vision, slow-healing cuts, genital itching or thrush, repeated urine infections, and extra hunger. The tenth, dark velvety skin patches, is a clue to insulin resistance rather than a symptom. Only a blood test confirms diabetes.
What are the first symptoms of type 2 diabetes?
Frequent urination, especially at night, and thirst are usually the first changes people notice, often with tiredness. Plenty of people get no early symptoms at all.
If blood sugar is high, what symptoms appear?
Mildly high sugar often causes nothing noticeable. As it climbs, thirst, frequent urination, tiredness, and blurred vision become likely. Vomiting, fruity breath, fast breathing, or confusion with very high sugar needs a hospital straight away.
Can you have diabetes without any symptoms?
Yes, and it is common. ICMR guidelines state that more than half of all people with diabetes have no symptoms at all. That is why screening from age 30 is advised in India.
What are the symptoms of diabetes in females?
Mostly the same as in men, plus repeated thrush, vaginal itching, and urine infections. PCOS and past gestational diabetes cause no symptoms themselves, but both raise risk enough to justify regular testing.
At what age should Indians get tested for diabetes?
From age 30, according to India's national NCD programme and ICMR, and earlier with risk factors like family history. Repeat every three years if normal, and yearly with prediabetes.
Which blood test is best for checking diabetes?
The oral glucose tolerance test is named by ICMR as the test of choice. Fasting sugar and HbA1c are also used, though ICMR notes HbA1c has some limitations in India. Confirm any high result with a repeat test on another day.
Are dark patches on the neck a sign of diabetes?
They can be. Dark, velvety patches on the neck or in skin folds, called acanthosis nigricans, usually point to insulin resistance, which often comes before type 2 diabetes. Some medicines cause them too, so a doctor visit and a sugar test are worth it.
References
- ICMR-INDIAB-17 Study, Lancet Diabetes and Endocrinology, 2023
- ICMR Guidelines for Type 2 Diabetes, 2018
- NHS: Type 2 Diabetes Symptoms
- MoHFW: NP-NCD Screening Update, March 2025
- DermNet: Acanthosis Nigricans
- WHO: Diabetes Fact Sheet, 2024
- NHS: Diabetic Ketoacidosis
Written by
Iraphan Khan, BSN, RN, D.Pharm, Public Health Researcher
Founder of RealMedVision, writing patient-focused health content based on clinical guidelines and peer-reviewed research.
Medically reviewed by
Dr Praveen Verma, MBBS, MD (Pathology), Pathologist and Clinical Laboratory Specialist
Dr Himanshu Morya, MBBS, Medical Educator
Review date: 11 September 2026
Medical disclaimer: This article is for general education and does not replace advice from your own doctor. It does not diagnose or treat any condition. If you have symptoms of diabetes, please get a blood test and speak with a qualified doctor. In an emergency, call 112 or go to the nearest hospital.