Lung adenocarcinoma is a slow-growing lung cancer that starts deep in the small airways. Early symptoms mimic a cold, so many people ignore the first warning signs.

Dry cough is the hallmark. It hangs around for weeks, won’t clear with cough syrup, and tends to get worse at night.

Shortness of breath creeps in. You puff climbing one flight of stairs or can’t finish a sentence without pausing.

Chest pain shows up later. It feels like a dull, heavy weight or a sharp stab when you breathe deep or cough.

Blood-tinged sputum is a red flag. You may notice pink streaks or rust-colored flecks in your spit.

Fatigue and weight loss follow. You feel tired all the time, and clothes feel looser even though you’re not trying to lose weight.

Late signs include hoarseness, face swelling, or bone pain—an alarm the cancer has spread.