AI Summary Overview
What is Lung Cancer?
Lung cancer is a type of cancer which develops when normal lung cells undergo genetic changes and grow uncontrollably, forming a tumour. These tumours can eventually invade the surrounding healthy lung tissue and spread to other organs via the bloodstream, a process called metastasis.
Lungs help inhale oxygen and exhale carbon dioxide. As the tumour develops within them, it interferes with their breathing. It leads to breathing problems, chronic cough and other serious symptoms that often get misattributed, leading to a delayed diagnosis.
Types of Lung Cancer
Lung cancer comes in two primary forms:
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Non-Small Cell Lung Cancer (NSCLC) Medical research shows that about 85% of all cases of lung cancer are due to NSCLC. It usually develops from the outer lining cells of the lungs and spreads more slowly than small lung cancer. NSCLC has mainly three subtypes: squamous cell carcinoma, adenocarcinoma, and large cell carcinoma.
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Small Cell Lung Cancer (SCLC) Small cell lung cancer (SCLC) is a less common variant of lung cancer, affecting around 15% of lung cancer cases, and is highly aggressive. It arises from neuroendocrine cells in the lungs and tends to grow and spread rapidly, often reaching other parts of the body before diagnosis. Unlike NSCLC, tobacco smokers are at a higher risk of getting SCLC than non-smokers.
How Common is Lung Cancer in India?
Lung cancer is the most common form of cancer among Indian males. In fact, in 2025, over 80,000 new lung cancer patients were reported, as per clinical studies. The high prevalence rate is mainly due to increasing air pollution and a significant portion of the population being heavy smokers.
Other contributing factors to lung cancer are the widespread existence of diseases like tuberculosis (TB) in India, especially in rural areas. Lung cancer cases are also under-reported in India due to a lack of public awareness and limited access to healthcare in the country.
What are the Symptoms of Lung Cancer?
Lung cancer symptoms may vary depending on the size of the tumour and whether it has spread beyond the lungs. While early symptoms are often subtle, advanced disease can show more severe respiratory and systemic symptoms. Some of the early and advanced stage symptoms of lung cancer are:
| Subtle or Early Symptoms | Advanced Stage Symptoms |
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What Causes Lung Cancer?
Some major causes and risk factors of lung cancer include:
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Causes
- Tobacco Smoking: Smokers are at a much higher risk of getting lung cancer compared to non-smokers.
- Secondhand Smoke: The passive exposure to secondhand smoke in the home or workplace has also been proven to be a cause of lung cancer for non-smokers.
- Pollution: Chronic inhalation of particulate matter (PM2.5), vehicle exhaust gases, and industrial emissions gradually injures lung cells.
- Radon Gas Exposure: Radon is a radioactive gas naturally present in soil that can enter homes and buildings. Long-term exposure to indoor air is a major cause of non-smokers developing lung cancer.
- Occupational Carcinogens: High asbestos exposure (a fibrous mineral in older construction) and arsenic, diesel exhaust, and some industrial chemicals greatly increase the risk over time.
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Risk Factors
- Age 50+: Lung cancer risk is significantly higher after age 50; most diagnoses are made after 50 years of age.
- Personal or Family History: If a person or family member has previously been diagnosed with lung cancer, or a close relative has had lung cancer, then the person's risk is increased.
- Chronic Lung Diseases: Diseases like COPD, pulmonary fibrosis (scarring of the lung tissue) and tuberculosis (TB) can make lung cells more likely to become cancerous.
- Radiation to the Chest: Radiation treatment in the chest for other cancers increases the chance of developing lung cancer later in life.
What are the Stages of Lung Cancer?
Lung cancer is staged according to the size of the tumour, lymph node, and whether it has spread to other organs. These include:
| Stage | Features |
| Stage 0 (Carcinoma in Situ) | Abnormal cells remain confined to the lining of the airways without invading nearby tissue. |
| Stage I | Cancer is limited to the lung and has not spread to nearby lymph nodes. Surgery is often the preferred treatment. |
| Stage II | Cancer has spread to nearby lymph nodes or surrounding lung tissue but remains within the chest. |
| Stage III | Cancer has spread to multiple lymph nodes or nearby structures such as the chest wall or mediastinum. Combined treatment is usually required. |
| Stage IV | Cancer has spread to your other lung, the lining fluid around the heart and lungs and other distant organs. Treatment focuses on controlling disease progression and improving quality of life. |
Disease Similar to Lung Cancer
A persistent cough, dyspnoea, chest pain and weight loss can all be indications of lung cancer, tuberculosis (TB) and chronic obstructive pulmonary disease (COPD). But the causes, course, therapeutic strategies, and long-term prognoses of many illnesses vary. The table below outlines the distinctions to understand symptoms better.
Lung Cancer vs Tuberculosis vs Chronic Obstructive Pulmonary Disease (COPD)
| Feature | Lung Cancer | Tuberculosis (TB) | Chronic Obstructive Pulmonary Disease (COPD) |
| How it Happens | Uncontrolled growth of abnormal lung cells forms a malignant tumour. | Bacterial infection caused by Mycobacterium tuberculosis. | Long-term damage to the airways, usually caused by smoking or prolonged exposure to pollutants. |
| Location | Lung tissue, with possible spread to other organs. | Mainly affects the lungs but may involve other organs. | Airways and air sacs of the lungs. |
| Associated Symptoms | Persistent cough, coughing up blood, chest pain, weight loss, breathlessness. | Persistent cough, fever, night sweats, weight loss, coughing up blood. | Chronic cough, wheezing, breathlessness, and excess mucus production. |
| Severity | Potentially life-threatening and may spread to distant organs if untreated. | Curable with appropriate antibiotic treatment, but serious if left untreated. | Progressive chronic disease that can be controlled but not cured. |
| Can It Be Reversed? | No. Early treatment may achieve remission or long-term disease control. | Yes. Most cases are curable with a complete course of anti-tubercular medicines. | No. Lung damage is permanent, although symptoms can be managed with treatment and lifestyle changes. |
What are the Complications of Lung Cancer?
Complications associated with lung cancer include:X
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Metastasis: Lung cancer often metastasises (spreads) to the brain, liver, bones and adrenal glands, making treatment difficult.
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Pleural Effusion: Fluid building up in between the lungs makes breathing harder and increases chest pain.
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Breathing Problems: As major airways become increasingly obstructed by advanced tumours, breathing can become more difficult.
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Superior Vena Cava Syndrome: A tumour will compress the superior vena cava, which is the largest vein that brings blood to the heart, resulting in swelling of the face and neck.
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Bone Fractures: If cancer spreads to the bones, they become weaker, and fractures can occur from a minor injury.
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Neurological Complications: It can spread to the brain, leading to seizures, memory loss, confusion and weakness of the limbs.
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Paraneoplastic Syndromes: Unusual immune reaction from cancer that affects other organs, such as unusual hormonal changes or muscle weakness.
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Side Effects Related to Treatment: Chemotherapy, radiation, and surgery can each have their own side effects, including tiredness, weakness, and a weakened immune system.
When Should I See a Healthcare Provider?
It is advisable to see an oncologist if you experience the following:
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Recurrent cough that lasts longer than three weeks
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Blood-stained cough
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Unexplained weight loss
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Short of breath during normal activities
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Any persistent chest or shoulder pain
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Lumps in the neck causing breathing or swallowing problems
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Changes in the voice
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Current smokers or former smokers who develop respiratory symptoms
How is Lung Cancer Diagnosed?
Doctors often use a combination of several tests to diagnose lung cancer. These tests include:
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Chest X-Ray The first investigation is done when a lung problem is suspected. It can show up onscreen as obvious masses or abnormal areas.
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Low-Dose CT Scan (LDCT) A CT scan is a detailed examination of the lungs using cross-sectional pictures. For high-risk people (long-term smokers, over 50), LDCT is recommended. It can detect tumours much earlier than a regular X-ray.
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Positron Emission Tomography (PET) Scan A PET scan can help determine if a tumour is metabolically active and may be useful for determining whether cancer has spread to other parts of the body. It is also used to determine how far the cancer has spread.
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Biopsy In a biopsy, a small piece of tumour tissue is taken for further examination under a microscope. This test often offers a confirmed diagnosis.
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Sputum Cytology A mucous sample coughed up from the lungs is analysed for cancer cells.
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Molecular and Genetic Testing When cancer is diagnosed, certain gene mutations can be identified. This is important for deciding which therapy to use for the patient.
Diagnostic Overview Table
| Test | Purpose | When Used |
| Chest X-Ray | Initial screening | First-line investigation |
| LDCT Scan | Early detection | High-risk individuals |
| Biopsy | Confirm the type of and/or subtype of cancer. | After imaging findings |
| PET Scan | Evaluate the extent of cancer spread. | Before treatment planning |
| Molecular Testing | Identify actionable mutations | After a confirmed diagnosis |
How is Lung Cancer Treated or Managed?
Lung cancer treatment and management methods include:
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Lifestyle Management
- Quit Tobacco: Quitting smoking can prevent the aggravation of lung cancer and minimise complications.
- Healthy Nutrition: A well-balanced protein diet keeps people strong and helps maintain their weight.
- Physical Activity: Light physical activity, such as walking, can help reduce fatigue and improve lung function.
- Breathing Exercises: Pulmonary rehabilitation may help you improve your breathing and quality of life.
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Medical Management
- Medications: Medications may be used to help prevent lung tissue damage.
- Surgery: Surgery may involve removing part or all of the affected lung, primarily in early-stage disease.
- Chemotherapy: Treats cancer with medicines and is possibly used in combination with other treatments.
- Radiation Therapy: Radiation therapy targets cancer cells with high-energy beams to destroy them or prevent their spread.
- Targeted Therapy: Selects cancer cells with specific gene mutations and avoids damaging healthy cells.
- Immunotherapy: Helps the immune system recognise and fight cancer cells.
- Palliative Care: Relief of symptoms, breathing support, and enhancement of quality of life while undergoing treatment.
Medicines Used in Lung Cancer Treatment
The choice of medicines depends on the type of lung cancer, its stage, and the presence of specific genetic mutations. An oncologist can help you plan your lung cancer treatment. Some of the medicines used to treat lung cancer are:
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Cisplatin: A platinum-based chemotherapy medicine that destroys rapidly dividing cancer cells. It is commonly used for both non-small cell and small cell lung cancer.
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Carboplatin: Often used as an alternative to cisplatin, especially in patients who may not tolerate stronger chemotherapy. It is frequently combined with other anticancer medicines.
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Pemetrexed: This chemotherapy medicine is mainly prescribed for certain types of advanced non-small cell lung cancer, particularly adenocarcinoma.
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Osimertinib: A targeted therapy used in patients whose tumours carry specific EGFR gene mutations. It blocks cancer cell growth while causing less damage to healthy cells.
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Alectinib: Used for advanced non-small cell lung cancer with ALK gene rearrangements. It helps slow disease progression and reduces the risk of brain metastasis.
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Pembrolizumab: An immunotherapy medicine that helps the immune system recognise and destroy cancer cells. It is used in selected patients with advanced lung cancer.
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Nivolumab: Another immune checkpoint inhibitor used when lung cancer progresses despite previous treatment.
Note: The drugs are given only once the type and stage of the lung cancer are confirmed. Each patient's treatment will be different, and a certified oncologist should always guide it.
Living with Lung Cancer in India: Challenges, Emotional Support and Financial Considerations
Lung cancer is a chronic disease requiring regular medical follow-up and lifestyle changes. A multidisciplinary approach with oncologists, family members, dietitians, physiotherapists and counsellors can help enhance quality of life during cancer therapy. If untreated, here is how lung cancer can affect your life:
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Daily Challenges
- Breathing difficulties: Breathlessness may limit physical activity and make routine tasks more tiring.
- Fatigue: Cancer and its treatment often reduce energy levels, making adequate rest and balanced nutrition essential.
- Reduced appetite: Maintaining nutritional intake may become difficult during chemotherapy or radiation therapy.
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Lifestyle and Home Care
- Avoid tobacco smoke: Staying away from active and passive smoking helps protect the remaining healthy lung tissue.
- Improve indoor air quality: Proper ventilation and reduced exposure to indoor pollutants can ease breathing.
- Stay physically active: Gentle activities, such as walking and breathing exercises, can improve stamina and lung function.
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Emotional Well-being
- Mental health support: Anxiety and depression are common after a lung cancer diagnosis and may benefit from professional counselling.
- Family involvement: Emotional support from caregivers and loved ones can help patients cope with treatment-related stress.
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Financial Planning
- Expenses: Lung cancer treatment frequently includes multiple hospital visits, imaging tests, medications, surgery, chemotherapy or immunotherapy. Comprehensive health insurance and critical illness cover can help alleviate the financial strain of long-term treatment.
What is the Prognosis of Lung Cancer?
Many factors affect the lung cancer prognosis, including the stage at which the cancer was diagnosed and the type of cancer.
If caught at early stages when the spread of cancer cells is minimal, the prognosis is favourable for long-term remission, achieved through surgical removal and continuing treatment.
In the advanced stages, the treatment is to control the cancer, slow its growth and maintain quality of life. For patients with certain gene mutations, targeted therapies and immunotherapies have significantly improved survival.
How Can I Prevent Lung Cancer?
Although many cases of lung cancer cannot be prevented, some can be prevented by making the right choices and being aware. The most effective action is to stop smoking or not start. Each year that a person refrains from smoking, the cumulative risk decreases. Some ways to prevent lung cancer are:
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Avoid Secondhand Smoke: Keep your home and workplace smoke-free.
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Minimise Exposure to Pollution: Wear a mask when pollution levels are high, and avoid exercising in areas with heavy traffic.
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Test Your Home for Radon: If soil radon levels are high, or if a radon testing kit is available, consider testing your home for radon.
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Work with Protective Equipment: When working with asbestos, diesel fumes or chemicals, use proper respiratory protection gear consistently.
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Enhance Indoor Air Quality: Use air purifiers to reduce indoor pollution in homes and workspaces.
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Have Regular Check-Ups: If you are aged 50 or older and you have smoked for a long time, consult your doctor if you experience any lung-related issues.
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Eat a Healthy Diet: Consume a diet that is rich in fruits and vegetables, especially antioxidants.
Lung Cancer Treatment Cost in India
In India, the cost of treating lung cancer depends on the cancer stage, treatment type, hospital, city, and duration of therapy. Treating at an early stage is usually more affordable than treating an advanced disease with targeted therapy or immunotherapy. The estimated cost range for different treatments of lung cancer is given below:
| Treatment | Estimated Cost Range |
| Oncologist consultation | ₹800–₹3,000 |
| Chest CT scan | ₹3,000–₹10,000 |
| PET-CT scan | ₹10,000–₹30,000 |
| Bronchoscopy | ₹5,000–₹25,000 |
| Lung biopsy | ₹20,000–₹1.5 lakh |
| Molecular testing (EGFR/ALK/ROS1) | ₹20,000–₹22,000 |
| Lung cancer surgery | ₹2 lakh–₹12 lakh |
| Chemotherapy (per cycle) | ₹12,000–₹1 lakh |
| Radiation therapy | ₹60,000–₹3 lakh |
| Targeted therapy (monthly) | ₹80,000–₹3 lakh |
| Immunotherapy (per cycle) | ₹1.5 lakh–₹4 lakh |
Note: The above treatment expenses are estimates and may vary depending on lung cancer stage, treatment strategy, hospital, city, specialist fees, and patient health. For a personalised cost estimate, consult your oncologist or hospital.
Does Health Insurance Cover Lung Cancer?
Yes. Most health insurance plans in India cover lung cancer treatment. Coverage includes in-patient hospitalisation, day care procedures, diagnostic tests, chemotherapy and radiation therapy, as per the policy's terms. In addition, cancer insurance or critical illness insurance plans can provide a lump sum payout upon the diagnosis of a specified severity of lung cancer.
Health insurers cover lung cancer after a waiting period. If lung cancer has been diagnosed before taking health insurance, the disease is considered a pre-existing disease (PED) and has a waiting period of up to 3 years, based on the policy’s conditions. However, for critical illness insurance, you have to fulfil a waiting period of up to 90 days and a survival period of 30 days.
Before purchasing a policy, carefully review the terms and conditions, including waiting periods, sub-limits, room rent restrictions, and cancer-specific exclusions.
How Much Health Insurance Coverage is Needed for Lung Cancer?
The cost of lung cancer therapy may vary widely, depending on the stage of the disease, the treatment method, and the medical facility providing the treatment. Early-stage lung cancer treatment charges may be between ₹3 lakh and ₹8 lakh. But if the disease is in advanced stages and needs multiple treatments and long-term care, then it may cost ₹8 lakh to ₹18 lakh or more.
Usually, a sum insured of ₹20 lakh to ₹25 lakh is suggested for health insurance coverage to provide adequate protection against lung cancer.
People with risk factors like a history of smoking, cancer in the family or high exposure to air pollution might also want to consider adding a critical illness cover or buying a top up insurance policy for added financial protection if required.
FAQs
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Q1. What is the most common type of lung cancer in India?
Ans: Adenocarcinoma is the most common type of lung cancer in India, especially among women and non-smokers. It is a form of non-small cell lung cancer (NSCLC), which accounts for about 85% of lung cancer cases. -
Q2. Can non-smokers develop lung cancer?
Ans: Yes, lung cancer can occur in non-smokers. Risk factors include air pollution, secondhand smoke, radon gas, and exposure to industrial substances like asbestos. -
Q3. What are the early signs of lung cancer?
Ans: Early signs may include a cough lasting more than three weeks, mild voice changes, unexplained fatigue, and chest discomfort. Some people may have no symptoms in the early stages.
