Lung cancer remains one of the leading causes of cancer-related deaths worldwide, largely because it’s often diagnosed at an advanced stage — early symptoms are easy to mistake for a lingering cough, seasonal allergies, or general fatigue. At the same time, treatment has advanced significantly in the past decade, with targeted therapies and immunotherapy changing outcomes for many patients who wouldn’t have had good options even ten years ago. Here’s what to know.

Who Is at Risk?

Smoking Remains the Leading Cause

Cigarette smoking is the single biggest risk factor for lung cancer, and risk rises with both duration and intensity of smoking. Quitting at any age reduces risk over time compared to continuing.

But Non-Smokers Get Lung Cancer Too

This is a critical, often underappreciated point: a meaningful proportion of lung cancer patients have never smoked. Contributing factors include:

• Secondhand smoke exposure
• Air pollution — a growing concern in urban centers, including Hyderabad, with rising particulate matter levels
• Occupational exposure — asbestos, radon, certain industrial chemicals
• Family history and genetic factors
• Indoor air pollution from solid fuel cooking, particularly relevant in parts of India
• Certain genetic mutations (like EGFR) that occur more frequently in non-smoking lung cancer patients, especially women

If you’ve never smoked but have persistent respiratory symptoms, don’t assume lung cancer is “off the table” — it isn’t.

Symptoms That Warrant Evaluation

Early lung cancer often causes no symptoms at all, which is part of why it’s frequently caught late. When symptoms do appear, they include:

• A persistent cough lasting more than 3 weeks, or a chronic cough that changes in character
• Coughing up blood (even small amounts) — always warrants prompt evaluation
• Chest pain, especially if it worsens with deep breathing, coughing, or laughing
• Shortness of breath that’s new or worsening
• Hoarseness that persists
• Unexplained weight loss and loss of appetite
• Recurrent respiratory infections (like pneumonia) that keep coming back in the same area of the lung
• Persistent fatigue
• Bone pain, if the cancer has spread to bones
• New headaches or neurological symptoms, if there’s spread to the brain

A chronic cough is common and has many non-cancer causes. But a cough that’s changed character, lasted beyond three weeks, or is accompanied by blood, weight loss, or chest pain should be evaluated with imaging, not managed indefinitely with cough syrup.

How Lung Cancer Is Diagnosed

1. Chest X-ray — often the first test, though it can miss smaller tumors
2. CT scan — provides much more detail and is typically the next step if X-ray or symptoms raise concern
3. Biopsy — tissue sampling, often via bronchoscopy (a scope passed through the airway) or a needle biopsy guided by CT, to confirm diagnosis
4. PET-CT scan — helps determine whether the cancer has spread beyond the lung
5. Molecular/genetic testing — biopsy tissue is tested for specific mutations (EGFR, ALK, ROS1, and others) and PD-L1 expression, which directly determines whether targeted therapy or immunotherapy is a good option

This molecular testing step has become one of the most important developments in lung cancer care — two patients with the same stage of lung cancer can have very different treatment plans based on their tumor’s genetic profile.

Types of Lung Cancer

• Non-small cell lung cancer (NSCLC) — the most common type, accounting for the large majority of cases, including adenocarcinoma and squamous cell carcinoma subtypes
• Small cell lung cancer (SCLC) — less common, tends to grow and spread faster, and is treated differently, usually with chemotherapy and radiation as the primary approach

Treatment Options

Surgery

For early-stage NSCLC confined to the lung, surgical removal of the tumor (and sometimes part or all of the lung) offers the best chance of cure.

Radiation Therapy

Used for patients who aren’t surgical candidates, as a curative option for localized disease, or to relieve symptoms (palliative radiation) in advanced disease.

Chemotherapy

Used alone or combined with radiation, particularly for small cell lung cancer or in combination with immunotherapy for certain NSCLC cases.

Targeted Therapy

For NSCLC patients whose tumors carry specific mutations (like EGFR or ALK), targeted drugs can control the disease effectively with a different side effect profile than traditional chemotherapy — this has been one of the biggest advances in lung cancer treatment in recent years.

Immunotherapy

Checkpoint inhibitors have significantly improved outcomes for many NSCLC patients, particularly those with higher PD-L1 expression, and are increasingly used both in advanced disease and, for some patients, after surgery to reduce recurrence risk.

Lung Cancer Screening: Who Should Consider It

Unlike breast or cervical cancer, routine lung cancer screening isn’t universally recommended for the general population — but it is recommended for higher-risk individuals, typically:

• Long-term heavy smokers (current or who quit within the past 15 years)
• Generally within a specific age range (commonly 50-80), based on international guidelines

Screening uses low-dose CT scans, which can detect tumors before symptoms appear. If you have a significant smoking history, it’s worth discussing whether screening is appropriate for you, even without symptoms.

Frequently Asked Questions

Q: Can lung cancer be cured? Outcomes depend heavily on stage at diagnosis and cancer type. Early-stage lung cancer treated with surgery has significantly better outcomes than cancer diagnosed at an advanced stage — which is exactly why prompt evaluation of persistent symptoms matters so much.

Q: I’ve never smoked — can I still get lung cancer? Yes. While smoking remains the leading risk factor, non-smokers do develop lung cancer, sometimes with distinct genetic mutations that respond particularly well to targeted therapies.

Q: Is a persistent cough always a sign of lung cancer? No — most persistent coughs have benign causes like allergies, reflux, or post-infectious irritation. But a cough lasting more than three weeks, especially with other symptoms like weight loss or blood, should be evaluated rather than assumed benign.

Q: What does molecular/genetic testing of a lung tumor actually change? It can determine whether a targeted therapy pill — often with fewer side effects and better results than standard chemotherapy — is available for your specific cancer, or whether immunotherapy is likely to be effective based on markers like PD-L1.

Q: Does air pollution really contribute to lung cancer risk? Long-term exposure to high levels of air pollution, particularly fine particulate matter, is recognized as a risk factor for lung cancer, independent of smoking status.

Getting Evaluated

If you have a persistent cough, breathlessness, unexplained weight loss, or any of the symptoms above — with or without a smoking history — getting a chest X-ray or CT scan is a reasonable, worthwhile step rather than waiting it out.

Consult Dr. Harshavardhan Annadanam, medical oncologist in Hyderabad, for evaluation, diagnosis, and a personalized lung cancer treatment plan, including access to targeted therapy and immunotherapy options where appropriate.

This article is for general educational purposes and does not replace professional medical advice. Please consult a qualified doctor for any personal health concerns.