Many people believe lung cancer only affects smokers. However, the disease is increasingly diagnosed in individuals who have never smoked, including young people, those who exercise regularly, and those without underlying conditions. Secondhand smoke, air pollution, radon gas, occupational exposure, and genetic factors can all increase the risk of developing the disease. Below are signs that should not be overlooked, even if you have never smoked.

Persistent, lingering cough

A persistent cough is among the most common symptoms of lung cancer. The cough may be dry or produce phlegm, and it might not improve after many weeks despite treatment. If a cough lasts for more than three weeks or progressively worsens, especially without typical cold symptoms, individuals should seek medical examination to determine the cause.

Shortness of breath during light activity

If you previously climbed stairs or walked briskly without issue but now find yourself quickly winded or short of breath even with light activity, this could be an unusual sign. Tumors can narrow airways or cause fluid accumulation around the lungs, preventing proper lung expansion during breathing. This symptom is often confused with aging, decreased physical fitness, or asthma.

Persistent chest pain

The pain may be a dull ache or intensify with deep breaths, coughing, or laughing. Some individuals only experience chest tightness or discomfort on one side, often dismissing it. While chest pain is not always caused by lung cancer, if it persists or accompanies other respiratory symptoms, early medical examination is advisable for an accurate diagnosis.

Unexplained weight loss or fatigue

Cancer can cause the body to expend more energy, leading to weight loss even without dieting or increased physical activity. Persistent fatigue and a lack of vitality are also common symptoms. These signs are easily mistaken for work pressure or insufficient sleep, but if they continue for many weeks without a clear explanation, medical examination is required.

Unexplained weight loss can be a warning sign of cancer. Photo: Ngoc Pham

Coughing up blood or recurrent respiratory infections

Coughing up blood, even a small amount, is a sign that requires immediate evaluation. Recurrent pneumonia or bronchitis in the same part of the lung can also indicate a tumor causing airway obstruction. Experts advise against prolonged self-treatment if respiratory infections continuously recur or do not respond as expected.

Early-stage lung cancer may not cause symptoms or present with very vague signs. Therefore, early screening helps expand treatment options and improve the disease prognosis.

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