Diabetes Symptoms: What to Look For, How It Is Diagnosed, and How to Manage It

Quick answer

The classic early symptoms of diabetes are passing urine frequently, especially at night, feeling unusually thirsty, unexplained weight loss and persistent tiredness. Many people have no symptoms at all in the early stages, which is why testing matters. Diagnosis is made on blood tests, not on symptoms. In India, screening is recommended earlier than in Western countries because diabetes develops younger and at lower body weights.

Key takeaways

• Symptoms often appear late. Type 2 diabetes can be present for years without any noticeable signs, so a blood test is the only reliable way to know.

• India develops diabetes younger and slimmer. Indians are affected at lower body weights and earlier ages than Western populations, so the usual "screen after 40 if overweight" advice does not fit.

• Gestational diabetes is screened differently in India. National guidance uses a single-step non-fasting glucose test at the first antenatal visit and again at 24 to 28 weeks.

• In children, diabetes symptoms can escalate fast. A child who is suddenly thirsty, losing weight, or wetting the bed again after being dry needs testing urgently, not next week.

• Know the two emergencies. Very high sugar with vomiting, deep breathing and drowsiness, and very low sugar with sweating, shaking and confusion, both need immediate action.

What is diabetes?

Diabetes is a condition where blood glucose stays higher than it should, either because the body does not make enough insulin, or because it cannot use insulin properly, or both.

Scale in India matters here. The ICMR-INDIAB study estimated that over 100 million adults in India are living with diabetes and a larger number again with prediabetes. Indians also tend to develop it about a decade earlier than Western populations, and at lower body mass index, with more fat around the abdomen relative to overall weight. This is why Indian guidance uses lower weight thresholds and earlier screening.

What are the common symptoms of diabetes?

The most important point about this list: many people with type 2 diabetes have none of these symptoms for years. Symptoms are a reason to test. The absence of symptoms is not a reason to skip testing.

Warning signs in children

Type 1 diabetes in children progresses over days to weeks, not years, and it is frequently missed until the child is seriously unwell.

Test urgently if a child has:

• Started drinking much more than usual, and asking for water at night

• Started passing urine much more, or has begun wetting the bed again after being reliably dry

• Lost weight, or looks thinner in the face

• Become unusually tired, irritable or withdrawn

• Developed recurrent thrush or nappy rash that will not clear

Go to a hospital immediately if a child also has:

• Vomiting, tummy pain, and deep, rapid or sighing breathing

• A sweet or fruity smell to their breath

• Drowsiness, confusion, or being hard to rouse

These suggest diabetic ketoacidosis, which is a medical emergency. It is often initially mistaken for a stomach infection, so it is worth asking directly: "Could this be diabetes?" A finger-prick blood glucose test takes seconds and is available in any clinic.

How is diabetes diagnosed?

On blood tests, not on symptoms. Any one of the following, generally confirmed on a second occasion unless symptoms are clear and the reading is high:

Practical notes. A home glucometer reading is useful for monitoring, but diagnosis needs a laboratory test. HbA1c can be misleading if you have anaemia, a haemoglobin variant such as thalassaemia trait, or recent blood loss, all of which are relevant in India, so your doctor may prefer a glucose-based test.

Who should be screened, and from what age?

Indian guidance recommends screening earlier than Western guidance, because the disease appears earlier here.

Get tested from around age 30, and earlier if you have any of:

• A parent, brother or sister with diabetes

• Overweight by Asian Indian standards, meaning a BMI of 23 or above, or a waist over 90 cm for men and 80 cm for women

• A previous pregnancy affected by gestational diabetes

• Polycystic ovary syndrome

• High blood pressure or abnormal cholesterol

• A sedentary lifestyle

• A previous prediabetes result

Waist matters as much as weight in Indians. Someone with a normal BMI but a large waist can still carry significant risk, which is why "I am not fat, so I am fine" is unreliable here.

Gestational diabetes: what pregnant women should know

Gestational diabetes is raised blood glucose first identified during pregnancy. It is common, usually manageable, and usually resolves after delivery.

How it is screened in India

Indian national guidance uses a single-step test that does not require fasting, which makes it far more practical in routine antenatal care. A 75 gram glucose drink is given regardless of when you last ate, and blood glucose is checked two hours later.

• A 2-hour value of 140 mg/dL or above is taken as gestational diabetes

• Testing is recommended at the first antenatal visit, and repeated at 24 to 28 weeks if the first test was normal

Some hospitals use fasting-based criteria instead, with different thresholds. Both are in use in India, so ask which test you are having and what your result means.

Why it is treated

Well-controlled gestational diabetes usually leads to a normal pregnancy and a healthy baby. Poorly controlled GDM raises the chance of a large baby, difficult delivery, caesarean birth, pre-eclampsia, and low blood sugar in the baby after birth.

How it is managed

1. Diet and portion changes first, usually with a dietitian. This alone controls the majority of cases

2. Regular walking after meals, if your obstetrician approves exercise

3. Home glucose monitoring, usually fasting and after meals

4. Insulin if needed. Insulin is safe in pregnancy and does not harm the baby. Needing it is not a failure

5. Extra scans to monitor the baby's growth

The part that gets forgotten

Get an oral glucose tolerance test 6 to 12 weeks after delivery, and then regularly for life. A large proportion of women with gestational diabetes go on to develop type 2 diabetes, and this postpartum test is one of the most commonly skipped steps in Indian antenatal care. Put it in your calendar before you deliver.

Breastfeeding is associated with a lower risk of later type 2 diabetes for the mother, which is one more reason to seek good feeding support.

If you already have diabetes and are planning pregnancy

Speak to your doctor before conceiving. Blood glucose targets are tighter before and during pregnancy, some medications need changing, a higher dose of folic acid is usually advised, and certain drugs such as ACE inhibitors and statins are stopped. This is a planned conversation, not a post-positive-test one.

How is diabetes managed?

Lifestyle, which does most of the work

On rice specifically, since it comes up in every Indian consultation: rice is not forbidden. Portion size, what you eat alongside it, and total daily carbohydrate are what matter. A smaller serving of rice with plenty of dal, sabzi, curd and salad behaves very differently from a large plate of rice alone.

Medication

Medication is decided by your doctor based on your glucose levels, other conditions, kidney function, weight and cost. Options range from metformin and other oral medicines to newer drug classes and insulin.

Two things worth saying plainly:

• Insulin is not a last resort or a punishment, and it is not addictive. For some people it is the right treatment from the start.

• Do not stop or reduce medication because your sugar has improved. Improvement usually means the treatment is working. Any change should come from your doctor.

Monitoring and complication checks

Emergency warning signs

Go to hospital immediately for high blood sugar with:

• Vomiting, and inability to keep fluids down

• Abdominal pain

• Deep, rapid or sighing breathing

• A fruity or sweet smell on the breath

• Drowsiness, confusion or difficulty waking

• Very high glucose readings that are not coming down

Treat low blood sugar immediately. This mainly affects people on insulin or sulfonylurea tablets. Signs include sweating, shaking, palpitations, sudden hunger, irritability, confusion, slurred speech and blurred vision.

What to do: take about 15 grams of fast-acting sugar, such as three to four teaspoons of glucose powder or sugar in water, or half a glass of regular soft drink or fruit juice. Wait 15 minutes and recheck. Repeat if still low, then eat a snack or meal.

Call for emergency help if the person is unconscious, fitting, or unable to swallow. Do not put food or liquid into the mouth of someone who is not fully conscious.

Also seek prompt care for: a foot ulcer, wound or blister that is not healing, any black or discoloured area on the foot, sudden vision loss, chest pain, or breathlessness.

Myths worth clearing up

When should you see a doctor?

Book a test if you have:

• Any of the classic symptoms, particularly thirst, frequent urination or unexplained weight loss

• Recurrent infections, thrush, boils or slow-healing wounds

• Numbness or tingling in the feet

• Dark velvety patches on the neck or armpits

• A family history of diabetes and you are over 30 and have never been tested

• A previous pregnancy affected by gestational diabetes

• PCOS, high blood pressure or high cholesterol

Seek care the same day if:

• A child has thirst, weight loss or new bedwetting, especially with vomiting or drowsiness

• Anyone has very high readings with vomiting, abdominal pain or deep breathing

• Low blood sugar is not improving with sugar, or the person is confused or unconscious

• There is a non-healing foot wound, or any black or discoloured area on the foot

• There is sudden vision loss

Frequently asked questions

What are the first signs of diabetes?
Frequent urination, especially at night, unusual thirst, tiredness and unexplained weight loss. Many people have no symptoms at all early on, so testing matters more than waiting for signs.

At what age should Indians get tested for diabetes?
Earlier than Western guidance suggests. From around age 30, and sooner if you have a family history, a large waist, PCOS, high blood pressure, or a previous gestational diabetes pregnancy.

Can you have diabetes without symptoms?
Yes, commonly. Type 2 diabetes can be present for years before it causes any noticeable symptom, which is why screening exists.

What is the normal blood sugar level?
Fasting below 100 mg/dL and HbA1c below 5.7% are considered normal. Fasting of 126 mg/dL or more, or HbA1c of 6.5% or more, is in the diabetes range. Your doctor interprets this alongside your overall picture.

How is gestational diabetes tested in India?
Usually with a single-step 75 gram glucose test that does not require fasting, with a 2-hour value of 140 mg/dL or above indicating gestational diabetes. It is done at the first antenatal visit and repeated at 24 to 28 weeks.

Will gestational diabetes harm my baby?
Well-controlled gestational diabetes usually leads to a healthy pregnancy and baby. Poor control raises the risk of a large baby, delivery complications and low blood sugar in the newborn, which is why monitoring matters.

Is insulin safe in pregnancy?
Yes. Insulin does not cross to the baby in a harmful way and is the standard treatment when diet alone is not enough.

Does gestational diabetes go away after delivery?
Blood glucose usually returns to normal, but the risk of developing type 2 diabetes later is substantially raised. Have an oral glucose tolerance test 6 to 12 weeks after delivery, and continue regular testing afterwards.

Can I still eat rice if I have diabetes?
Yes, in controlled portions and alongside dal, vegetables, curd and protein. Total carbohydrate across the day is what matters, not banning one food.

Can diabetes be reversed?
Prediabetes can often be reversed with weight loss and activity. Some people with early type 2 diabetes achieve remission with substantial weight loss, though it requires medical supervision and ongoing monitoring. Type 1 diabetes cannot be reversed.

The bottom line

Diabetes frequently announces itself late or not at all, which makes testing more useful than symptom-watching, particularly in India where it develops earlier and at lower body weights than the standard advice assumes. If you are pregnant, make sure you are screened at both the recommended points, and book the postpartum test before you forget about it. And learn the two emergencies, because very high sugar with vomiting and drowsiness, and very low sugar with confusion, are both situations where knowing what to do in the first ten minutes matters.

Sources

• Indian Council of Medical Research, guidelines for management of type 2 diabetes, and the ICMR-INDIAB national study

• Ministry of Health and Family Welfare, Government of India, national guidelines for diagnosis and management of gestational diabetes mellitus

• World Health Organization, classification and diagnostic criteria for diabetes mellitus, and diagnostic criteria for hyperglycaemia in pregnancy

• American Diabetes Association, Standards of Care in Diabetes

• International Diabetes Federation, Diabetes Atlas

• Research Society for the Study of Diabetes in India (RSSDI), clinical practice recommendations

• Federation of Obstetric and Gynaecological Societies of India, gestational diabetes guidance

This article is for general information and is not a substitute for medical advice. Diagnosis and treatment must come from a doctor. Seek emergency care for vomiting with drowsiness and deep breathing, or for low blood sugar with confusion or loss of consciousness.