Lung cancer continues to be one of the most serious health challenges in cancer cases globally. India, lung cancer accounts for 5.9% of all cancers and. 8.1% of all cancer-related deaths. In urban scenarios changing lifestyle factors, smoking and tobacco use, pollution, and occupational exposures intersect increasing risk of lung cancer. Awareness about lung cancer is not just important, but also essential. As a cancer specialist, one of the most concerning aspects of lung cancer is that it often remains silent in its early stages. By the time symptoms become noticeable, the disease may already be advanced. However, with increasing awareness, timely screening, and advances in treatment, outcomes today are far more hopeful than they were a decade ago.
Understanding Lung Cancer
Lung cancer occurs when abnormal cells in the lungs begin to grow uncontrollably, forming a tumour that interferes with normal breathing and oxygen exchange. The lungs, which are responsible for delivering oxygen to the bloodstream, become compromised as cancer progresses.
Broadly, lung cancer is classified into two main types:
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Non-Small Cell Lung Cancer (NSCLC)
Accounts for nearly 80–85% of cases. This includes subtypes such as adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. -
Small Cell Lung Cancer (SCLC)
Less common but more aggressive, often associated strongly with smoking.
In the medical world, we increasingly go beyond these classifications. Molecular profiling, identifying mutations like EGFR or ALK, has transformed how we approach treatment, allowing for more personalised therapies. One important point to understand: early-stage lung cancer may not cause any symptoms at all. This is why high-risk individuals (especially long-term smokers) benefit from periodic screening.
Warning Signs of Lung Cancer
Patients usually disregard these warning signs, considering them to be caused by environmental pollution, seasonal illness, or irritation of the lungs by smoking. These symptoms should always be taken seriously.
The most common symptoms of lung cancer in adults are:
- Constant coughing that doesn’t go away
- Coughing out blood (hemoptysis) or rusty-coloured phlegm
- Difficulty breathing or wheezing
- Chest pain that worsens when you breathe deeply or cough
- Voice changes like hoarseness
- Frequent respiratory illnesses like pneumonia or bronchitis
The general symptoms that appear at a later stage are:
- Unexpected weight loss
- Lack of appetite
- Feeling tired all the time
- Finger clubbing, meaning your fingertips look wider than usual
Advanced symptoms of lung cancer include:
- Musculoskeletal pain
- Headaches
- Nausea and vomiting
- Edema of face and neck
We encounter patients who have been diagnosed late with lung cancer in our Indian setting, mainly due to confusion with other diseases such as tuberculosis and bronchitis.
Causes of Lung Cancer
Lung cancer is not caused by a single factor. Instead, it develops due to prolonged exposure to carcinogens, substances that damage lung cells over time.
Key lung cancer causes include:
are at higher risk, especially in industrial settings. Workers must be given protective gears and ventilation at factories must be adequate to recue their exposure.
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Tobacco Smoking
This remains the leading cause, responsible for nearly 85–90% of cases. Cigarette smoke contains thousands of chemicals, many of which are known carcinogens. -
Second-hand Smoke
Non-smokers exposed to smoke at home or work are also at significant risk. In Indian households, this is a frequently underestimated factor. -
Air Pollution
Urban air quality, particularly in cities like Mumbai, plays a growing role. Fine particulate matter (PM2.5) penetrates deep into the lungs, causing long-term damage. -
Occupational Exposure
Workers exposed to substances such as:- Asbestos
- Arsenic
- Chromium
- Diesel exhaust
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Radon Gas
A naturally occurring radioactive gas that can accumulate in poorly ventilated spaces. -
Genetic Factors
A family history of lung cancer or certain genetic mutations may increase susceptibility, even in non-smokers. It is important to emphasize: not all lung cancer patients are smokers. We are increasingly diagnosing lung cancer in non-smoking individuals, particularly women.
Risks of Lung Cancer
Risk factors help us identify who is more likely to develop lung cancer. Recognizing these allows for early screening and preventive strategies.
High-risk groups include:
- Long-term smokers (active or former)
- Individuals exposed to second-hand smoke
- People living in high pollution environments
- Workers in industries involving chemicals or dust
- Individuals with a family history of lung cancer
- Patients with prior lung diseases like pulmonary fibrosis
- Those who have received radiation therapy to the chest
Indian context considerations:
- Misdiagnosis or overlap with tuberculosis
- Delayed healthcare access in semi-urban areas
- Social stigma around smoking in women leading to underreporting
Clinically, we recommend screening (such as low-dose CT scans) for high-risk individuals, especially those above 50 years with a significant smoking history.
How to Detect Lung Cancer Early
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Identify high-risk individuals
Long-term smokers, those exposed to second-hand smoke, air pollution, or occupational chemicals should undergo regular screening. -
Opt for low-dose CT screening
This is the most effective tool for detecting early-stage lung cancer, often before symptoms develop. -
Do not ignore persistent symptoms
A cough lasting more than 2–3 weeks, breathlessness, chest pain, or blood in sputum requires immediate evaluation. -
Watch for subtle general signs
Unexplained weight loss, fatigue, or recurrent chest infections may be early indicators. -
Avoid self-diagnosis
Symptoms are often mistaken for infections like tuberculosis in India, leading to delays. -
Seek timely medical advice
Early consultation with a pulmonologist or oncologist ensures appropriate imaging and diagnosis.
Early detection not only improves survival but also allows for less aggressive treatment and better quality of life outcomes.
Lung Cancer Treatment at UMC Hospitals
At UMC Hospitals, lung cancer care follows a multidisciplinary approach, which is now the global standard of care. Lung cancer specialists in Navi Mumbai at our Department of Medical & Surgical Oncology evaluate each case individually, considering the type, stage, and patient’s overall health. It includes:
Accurate Diagnosis
- Imaging: Chest X-ray, CT scan.
- Biopsy for confirmation
- Molecular testing for targeted therapy decisions
Treatment Modalities
Surgery
Best suited for early-stage disease. Procedures may include:
- Lobectomy (removal of part of lung)
- Pneumonectomy (removal of entire lung in selected cases)
Chemotherapy
Uses anti-cancer drugs to destroy cancer cells. Often used:
- After surgery
- Along with radiation
- In advanced stages
Targeted Therapy
Focuses on specific genetic mutations (EGFR, ALK, etc.). This has significantly improved outcomes in selected patients.
Immunotherapy
Enhances the body’s immune system to fight cancer. Increasingly used in advanced lung cancer with promising results.
Palliative Care
Equally important, focuses on symptom relief, quality of life, and psychological support.
Lung cancer is a serious diagnosis, but it is no longer a hopeless one. Advances in screening, molecular diagnostics, and treatment have changed the landscape significantly.
From a oncologists perspective, three messages are critical: do not ignore persistent respiratory symptoms, quit smoking and seek early evaluation if you are in a high-risk group.
Medical statistics suggest that patients who present early and follow a structured treatment plan have significantly better outcomes, not just in survival, but in quality of life. Awareness, timely action, and access to the right care can make all the difference.
