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Introduction

Lung cancer is one of the most common and deadliest forms of cancer worldwide, accounting for millions of new cases and deaths each year. It occurs when abnormal cells in the lungs grow uncontrollably, forming tumors that interfere with the normal function of the respiratory system. The disease can affect anyone, but smoking remains the leading cause of lung cancer, contributing to the majority of cases.

Causes and Risk Factors

The primary cause of lung cancer is long-term exposure to tobacco smoke, including active smoking and secondhand smoke. Other risk factors include exposure to harmful substances such as asbestos, radon gas, air pollution, and certain chemicals. Genetic predisposition and a family history of lung cancer also increase susceptibility. While non-smokers can also develop lung cancer, their risk is considerably lower compared to those with a history of smoking.

Symptoms and Diagnosis

Lung cancer often develops silently in its early stages, making early detection difficult. Common symptoms may include persistent cough, coughing up blood, chest pain, shortness of breath, wheezing, and unexplained weight loss. Diagnosis typically involves imaging tests such as chest X-rays and CT scans, followed by biopsy procedures to confirm the presence of cancerous cells. Early detection is critical for improving survival rates, as treatment outcomes are more favorable when the disease is diagnosed at an earlier stage.