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Published on: Apr 30, 2022
2 minute read
By: Second Medic Expert

What Is PET Scan ?

A PET scan (positron emission tomography) is a type of imaging test that uses a radioactive tracer to look for changes in the function of cells and tissues. A tracer is a substance that is introduced into the body to make it easier to see certain areas or organs. The radioactive tracer used in PET scans emits positrons, which are tiny particles that collide with electrons in the body. This creates gamma rays that can be detected by a scanner and used to create images of the inside of the body. PET scans are often used to diagnose cancer because tumor cells typically have higher levels of activity than normal cells. They can also be used to check for treatment response, measure tumor size, and identify new tumors.

PET Scan is a nuclear medicine imaging test that uses a small amount of radioactive material, called a tracer, to look for disease in the body. A PET Scan can show how well organs and tissues are working. It can help find cancer, heart problems, and other diseases. A Positron Emission Tomography (PET) scan is a medical imaging test that helps physicians diagnose and treat diseases. PET scans use a small amount of radioactive material, called a tracer, to help physicians see how organs and tissues are functioning. The radioactive tracer is injected into the patient's body and travels to the organ or tissue being studied. Physicians can then see where the tracer collects on an image of the organ or tissue.

A PET scan is helpful in diagnosing cancer, heart disease, brain disorders, and other diseases. It can also help determine how well treatment is working. PET Scan is an acronym for Positron Emission Tomography. It's a type of medical imaging that uses a small amount of radioactive material to help diagnose and treat medical conditions. A PET scanner creates 3D images of the inside of the body. PET (positron emission tomography) scans use a small amount of radioactive material called a tracer to help doctors see certain areas of the body. The tracer is injected into a vein, and images are taken as it moves through the body.

PET scans are often used to find cancer because tumors absorb more of the radioactive material than normal tissue does. PET scans can also be used to measure blood flow, check how well drugs work, and see how active the brain is. A PET scan is a type of imaging test that uses radioactive tracers to look at the function and structure of organs and tissues in your body. A small amount of radioactive material is injected into your bloodstream and then scanned by a special camera. The camera creates pictures that show where the material has collected. This can help doctors see how well an organ is working or find tumors or other problems.

PET scan is short for positron emission tomography. It's a type of medical imaging that uses a radioactive tracer to look at organ function or tissue metabolism. The tracer is a small amount of radioactive material that's injected into the patient's bloodstream. It collects in organs and tissues, and a scanner detects the radiation emitted as it decays. This information is used to create cross-sectional images of the body that show how the organs and tissues are working. PET scans are most often used to detect cancer because tumors consume more energy than normal tissue and therefore have a higher metabolic rate. But they can also be used to evaluate other problems, such as heart disease, brain function, and joint damage.

PET scanning is a type of nuclear medicine imaging. A small amount of radioactive glucose (FDG) is injected into a vein and images are taken as the glucose moves through the body. Cancer cells use more energy than normal cells and therefore absorb more of the radioactive glucose. This allows tumors to be visualized on the scan. PET stands for Positron Emission Tomography. A PET scan is a medical imaging test that uses a radioactive tracer to look at organs and tissues inside the body. The tracer is injected into a vein, and images are taken as it moves through the body.

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Yellow Eyes and Skin Symptoms: Causes, Warning Signs and When to Seek Care

Yellowing of the eyes and skin is one of the most noticeable physical changes a person can experience. Often referred to as jaundice, this symptom is not a disease by itself but a sign of underlying health conditions. Understanding yellow eyes and skin symptoms is essential because they frequently indicate problems involving the liver, blood or bile ducts and may require urgent medical attention.

In India, jaundice is a common presentation across age groups due to infections, liver disease and metabolic disorders.

What Does Yellowing of Eyes and Skin Mean?

The yellow colour appears due to excess bilirubin in the blood.

Bilirubin is:

a yellow pigment
produced from the breakdown of red blood cells
processed and removed by the liver

When bilirubin builds up, it deposits in tissues, causing yellow discoloration.

Why the Eyes Turn Yellow First

The sclera, or white part of the eyes, contains elastic tissue that binds bilirubin easily.

This makes yellowing:

more visible in eyes
detectable before skin changes

Yellow eyes are often the earliest sign of jaundice.

Common Causes of Yellow Eyes and Skin

Liver-Related Causes

The liver plays a central role in bilirubin metabolism.

Common liver causes include:

viral hepatitis (A, B, C, E)
fatty liver disease
alcoholic liver disease
liver cirrhosis
drug-induced liver injury

ICMR reports viral hepatitis as a major cause of jaundice in India.

Bile Duct Obstruction

Blocked bile flow prevents bilirubin excretion.

Causes include:

gallstones
bile duct strictures
pancreatic or bile duct tumours

This type of jaundice is often associated with itching and pale stools.

Blood Disorders

Excess breakdown of red blood cells increases bilirubin production.

Conditions include:

hemolytic anemia
malaria
inherited blood disorders

The liver may be overwhelmed despite being healthy.

Infections

Certain infections directly affect liver function.

Examples include:

hepatitis viruses
leptospirosis
severe sepsis

WHO data highlights hepatitis as a leading infectious cause of jaundice globally.

Newborn and Pregnancy-Related Causes

While common in newborns, jaundice in adults always needs evaluation.

Pregnancy-related liver disorders can also cause yellowing.

Associated Symptoms That Provide Clues

Yellow eyes and skin are often accompanied by:

dark yellow or tea-coloured urine
pale or clay-coloured stools
itching
fatigue
abdominal pain
loss of appetite

These symptoms help identify the underlying cause.

When Yellowing Becomes Dangerous

Seek urgent medical care if yellowing is accompanied by:

high fever
severe abdominal pain
confusion or drowsiness
vomiting
rapid worsening of colour

These signs suggest severe liver or systemic disease.

Jaundice and Liver Function

The liver normally:

conjugates bilirubin
excretes it into bile

When liver cells are damaged, bilirubin accumulates.

Lancet studies confirm jaundice as a key marker of liver dysfunction.

Diagnostic Evaluation

Doctors evaluate jaundice using:

blood tests for bilirubin levels
liver function tests
viral markers
ultrasound or CT scans
additional tests based on findings

Early testing identifies reversible causes.

Impact on Daily Life

Persistent jaundice can affect:

energy levels
digestion
mental clarity
work performance

Untreated liver disease can progress silently.

Treatment Depends on the Cause

There is no single treatment for jaundice.

Management focuses on:

treating infection
relieving bile obstruction
stopping harmful medications
managing chronic liver disease

Self-medication can worsen liver injury.

Role of Preventive Healthcare

Preventive measures include:

hepatitis vaccination
safe drinking water
limiting alcohol intake
regular health checkups

NITI Aayog emphasises liver health in preventive care strategies.

Lifestyle Factors That Affect Liver Health

Risk factors include:

excessive alcohol
obesity
high-fat diets
unsafe injections

Addressing these reduces jaundice risk.

Importance of Early Detection

Early diagnosis:

prevents complications
improves recovery
reduces hospitalisation

Delays increase the risk of liver failure.

Jaundice Is a Symptom, Not a Diagnosis

Understanding this distinction is crucial.

Treating the symptom alone:

does not resolve the disease
may mask serious conditions

Medical evaluation is essential.

Conclusion

Yellow eyes and skin symptoms are visible warning signs that should never be ignored. Most often linked to jaundice, they reflect underlying problems involving the liver, bile ducts or blood. Early medical evaluation, accurate diagnosis and timely treatment are critical to prevent serious complications. Recognising these symptoms and seeking care promptly can protect liver health and save lives.

References

Indian Council of Medical Research (ICMR) – Hepatitis and Liver Disease Reports
World Health Organization (WHO) – Jaundice and Hepatitis Guidelines
National Family Health Survey (NFHS-5) – Liver and Metabolic Health Indicators
Lancet – Liver Function and Bilirubin Research
NITI Aayog – Non-Communicable Diseases and Liver Health
Statista – Liver Disease and Hepatitis Trends

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