Symptoms of Type 2 Diabetes in Adults: Early Signs and When to Get Tested

The symptoms of type 2 diabetes often develop gradually and may be easy to overlook at first. Recognizing the early warning signs can lead to earlier testing, diagnosis, and treatment, helping reduce the risk of long-term complications. This guide explains the most common symptoms of type 2 diabetes in adults, when to seek medical advice, and what to expect during testing.

Written by: Dr. Albana Greca, MD, MMedSc, Family Physician and Medical Author.

Medically reviewed by: Dr. Ruden Cakoni, MD, Endocrinologist.

Last reviewed: July 2026.

Quick Answer

Common symptoms of type 2 diabetes include frequent urination, increased thirst or hunger, fatigue, blurred vision, unexplained weight loss, slow-healing wounds, repeated urinary or yeast infections, and tingling or numbness in the hands or feet.

However, type 2 diabetes often develops slowly and may cause no obvious symptoms. Symptoms cannot confirm diabetes. Diagnosis requires laboratory testing such as fasting plasma glucose, HbA1c, or an oral glucose tolerance test.

The phrase “adult diabetes” is an older name commonly used for type 2 diabetes. It is no longer the preferred medical term because type 2 diabetes can also occur in children and teenagers, while type 1 diabetes can begin during adulthood.

Type 2 diabetes develops when the body does not respond effectively to insulin and, over time, the pancreas may no longer produce enough insulin to keep blood glucose within a healthy range. The condition can remain unnoticed for years, which is why testing is important when symptoms or risk factors are present.

Common Symptoms of Type 2 Diabetes in Adults

Type 2 diabetes can affect many parts of the body, and symptoms may appear slowly or remain mild for years. The image below highlights common warning signs to recognize, especially when several occur together or persist without a clear explanation.

common symptoms of type 2 diabetes

Frequent Urination and Increased Thirst

When blood glucose rises high enough, the kidneys remove more glucose through the urine. Water follows the glucose, which may lead to frequent urination, waking at night to urinate, dry mouth, and increased thirst.

These symptoms can also occur with urinary infections, prostate problems, medicines such as diuretics, excess fluid intake, kidney disease, and other conditions. Testing is needed to find the cause.

Increased Hunger

Some people feel hungry even after eating because glucose is not being used efficiently by the body’s cells. Increased hunger is not specific to diabetes and may also be related to sleep deprivation, stress, medicines, thyroid disease, or other health problems.

Fatigue and Weakness

High blood sugar, dehydration, disrupted sleep from nighttime urination, and difficulty using glucose for energy may contribute to fatigue. However, tiredness is extremely common and may also result from anemia, thyroid disease, sleep apnea, heart or kidney problems, infection, medication effects, depression, or poor sleep.

Blurred Vision

Changes in blood glucose may temporarily affect fluid balance in the eye and cause blurred vision. Persistent or sudden vision changes require medical assessment because they may have causes unrelated to diabetes or may signal an urgent eye or neurological problem.

Unexplained Weight Loss

When the body cannot use glucose properly, it may begin using stored fat and muscle for energy. Unexplained weight loss can occur in diabetes, particularly when glucose is markedly high, but it may also be caused by thyroid disease, cancer, digestive disorders, infection, depression, or other conditions.

Slow-Healing Cuts and Repeated Infections

Persistently high glucose may impair immune function and circulation, making wounds slower to heal. Urinary tract infections, genital yeast infections, skin infections, gum problems, and recurring boils may occur more often.

A wound on a numb or poorly circulated foot should be examined promptly. Do not use acids, hydrogen peroxide soaks, strong creams, herbal oils, or home remedies on a diabetic foot wound.

Tingling, Burning, or Numbness

Long-term high blood glucose can damage nerves, causing tingling, burning, pain, altered sensitivity, or numbness—often beginning in the toes or feet. These symptoms can also result from vitamin B12 deficiency, thyroid disease, trapped nerves, alcohol use, kidney disease, circulation problems, or other neurological conditions.

Learn more about diabetic neuropathy symptoms and other possible causes.

Darkened, Thickened Skin

Dark, velvety skin patches—most often around the neck, armpits, or groin—may be acanthosis nigricans, a finding associated with insulin resistance. It is not proof of diabetes and may have other causes, but it is a reason to discuss metabolic testing with a clinician.

Symptoms That May Reflect Complications

Sexual dysfunction, persistent numbness, kidney problems, eye disease, chest pain, stroke, or foot ulcers are not simply “symptoms of adult diabetes.” They may represent complications or separate medical conditions that require proper evaluation.

Diabetes-related complications may include:

  • Nerve pain, numbness, or loss of protective sensation
  • Reduced circulation and foot wounds
  • Kidney damage, sometimes without early symptoms
  • Retinal disease and vision loss
  • Erectile dysfunction or other sexual and bladder problems
  • Heart disease and stroke

Paralysis, stroke, coma, and death are not diagnostic symptoms of type 2 diabetes. They are severe outcomes or emergencies and should never be presented as ordinary warning signs.

Can You Have Type 2 Diabetes Without Symptoms?

Yes. Many people have no noticeable symptoms, or the changes develop so gradually that they are attributed to aging, stress, work, or poor sleep. A person may have elevated glucose for years before diagnosis.

This is why adults with risk factors may need screening even when they feel well. Risk factors include:

  • Prediabetes or a previous high glucose result
  • Overweight or obesity
  • Family history of type 2 diabetes
  • Age 35 or older
  • Low physical activity
  • High blood pressure or abnormal cholesterol
  • Polycystic ovary syndrome
  • Previous gestational diabetes
  • A history of cardiovascular disease
  • Use of medicines that may raise glucose, such as corticosteroids

How Is Diabetes Diagnosed?

Symptoms alone cannot diagnose diabetes. A clinician usually uses laboratory blood testing. Common diagnostic criteria for nonpregnant adults include:

Test Prediabetes range Diabetes range
Fasting plasma glucose 100–125 mg/dL 126 mg/dL or higher
HbA1c 5.7–6.4% 6.5% or higher
2-hour glucose during a 75-g OGTT 140–199 mg/dL 200 mg/dL or higher
Random plasma glucose No single prediabetes cutoff 200 mg/dL or higher with classic symptoms or hyperglycemic crisis

When there is no unequivocal hyperglycemia or crisis, an abnormal result usually needs confirmation. A home glucose meter is useful for patterns but should not be used alone to diagnose diabetes.

Read more about fasting glucose, HbA1c, oral glucose tolerance testing, and other diabetes blood tests.

Could the Symptoms Be Type 1 Diabetes in an Adult?

Yes. Adults can develop type 1 diabetes, including a more slowly progressive autoimmune form sometimes called latent autoimmune diabetes in adults. Rapid weight loss, marked thirst, frequent urination, ketones, vomiting, abdominal pain, fruity-smelling breath, or deep breathing require urgent assessment.

The type of diabetes should not be assumed from age or body weight alone. Some adults need antibody or C-peptide testing to clarify the diagnosis and select safe treatment.

When to Arrange Diabetes Testing

Arrange a medical appointment when you have:

  • Persistent thirst or frequent urination
  • Unexplained weight loss
  • Ongoing fatigue without a clear explanation
  • Repeated infections or slow-healing wounds
  • New blurred vision
  • Numbness or tingling in the feet or hands
  • Darkened velvety skin in body folds
  • A fasting or random glucose result above the usual range
  • Several type 2 diabetes risk factors even without symptoms

Do not begin diabetes medicine, insulin, supplements, or a restrictive “diabetes cure” diet before the diagnosis and diabetes type have been evaluated.

When Should You Seek Medical Help? Arrange Testing • Thirst or frequent urination • Fatigue or blurred vision • Slow-healing wounds • Tingling or numbness • Risk factors without symptoms Prompt Medical Care • Unexplained weight loss • Repeated high readings • New foot wound or infection • Persistent vomiting • Pregnancy with high glucose Emergency Help • Confusion or fainting • Deep or difficult breathing • Fruity-smelling breath • Severe dehydration • Ketones with vomiting
Symptoms may require routine testing, prompt medical assessment, or emergency care depending on severity.

Important Safety Note

Seek urgent medical care for severe thirst and urination with vomiting, dehydration, abdominal pain, deep or difficult breathing, fruity-smelling breath, confusion, marked drowsiness, fainting, or ketones. These may be signs of diabetic ketoacidosis or another hyperglycemic emergency.

Call emergency services for sudden facial drooping, one-sided weakness, speech difficulty, severe chest pain, or loss of consciousness. These are emergency symptoms—not routine signs used to diagnose type 2 diabetes.

Doctor’s Note

Do not wait for every “classic” symptom before requesting a test. Type 2 diabetes may be silent. If you have risk factors, an abnormal home reading, or symptoms that persist, fasting glucose and HbA1c can provide more useful information than trying to diagnose yourself from symptoms alone.

Most Asked Questions

What is usually the first symptom of type 2 diabetes?

There is no single first symptom. Increased thirst, frequent urination, fatigue, blurred vision, or repeated infections may occur, but many people notice no symptoms at all.

Can type 2 diabetes cause weight gain?

Excess weight can increase type 2 diabetes risk, but weight gain is not a reliable diagnostic symptom. Unexplained weight loss may occur when glucose is very high. Weight changes can have many causes.

Is dark skin around the neck a diabetes symptom?

Dark, velvety skin in the neck, armpits, or groin may be acanthosis nigricans and can be associated with insulin resistance. It does not prove diabetes, but testing may be appropriate.

Can diabetes cause sexual problems?

Long-term diabetes may contribute to erectile dysfunction, reduced sensation, vaginal dryness, infections, or bladder problems. These are possible complications, not diagnostic symptoms, and they deserve medical assessment.

Can I diagnose diabetes with a home glucose meter?

No. Home meters can identify concerning patterns, but diagnosis should be based on laboratory testing interpreted by a healthcare professional.

Can natural remedies treat early diabetes symptoms?

No herb or supplement should replace testing or proven care. Symptoms may reflect significant hyperglycemia or another medical condition, so the cause should be diagnosed before treatment decisions are made.

Educational safety note: This article is for general diabetes education only. It does not replace personal medical advice, diagnosis, or treatment. Do not start, stop, or change medicines, insulin, supplements, diet, or exercise plans without speaking with your healthcare professional.

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