What Are the 15 Early Signs of Lung Cancer?

Jul 14, 2025 Source: Cainiu Health

Dr. Qi Zhirong

Introduction

A persistent dry cough without obvious triggers, lasting for a prolonged period and gradually worsening in severity, with poor response to conventional antitussive medications, may be a symptom of early-stage lung cancer irritating the bronchial mucosa. Occasionally, blood streaks or small amounts of blood may appear in the sputum during coughing, typically presenting as bright red or dark red in color. This is associated with capillary rupture caused by tumor invasion of the bronchial mucosa and should be taken seriously.

Generally speaking, there is no established list of 15 early signs of lung cancer, as symptoms can vary among individuals. Common symptoms may include persistent dry cough, blood-tinged sputum, chest discomfort, unexplained fever, and sudden weight loss within a short period. If any abnormalities occur, timely medical consultation is recommended. Detailed explanations are as follows:

1. Persistent dry cough: A prolonged dry cough without obvious cause that gradually worsens and shows poor response to conventional antitussive medications may indicate early lung cancer irritating the bronchial mucosa.

2. Blood in sputum: Occasional presence of blood streaks or small amounts of blood in the sputum when coughing, usually bright red or dark red in color. This is associated with tumor invasion of the bronchial mucosa causing capillary rupture and requires attention.

3. Chest discomfort: Irregular chest discomfort or dull pain with non-specific localization, possibly worsening during coughing or deep breathing, often due to tumor pressure or invasion of chest wall tissues.

4. Unexplained fever: Persistent low-grade fever or recurrent fever without obvious signs of infection may indicate cancer-related fever caused by pyrogenic substances released from tumor tissue necrosis.

5. Sudden weight loss: Significant weight loss over a short period without intentional dieting or increased physical activity, accompanied by fatigue and reduced appetite, may represent systemic manifestations caused by tumor-induced energy depletion.

If any of the above symptoms appear, timely chest imaging and other relevant medical examinations at a hospital are necessary for early diagnosis and prompt intervention. Ignoring symptoms or delaying medical evaluation should be avoided to prevent missing the optimal window for intervention.

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