A pulmonary hemangioma is a benign tangle of blood vessels inside the lung. Most stay quiet, but if they bleed or press on airways they send clear signals.

Dry cough is the early clue. It hangs around for weeks, won’t clear with cough syrup, and can start or stop suddenly.

Blood-tinged sputum is the red flag. You may notice pink streaks or rust-colored flecks in otherwise clear spit.

Shortness of breath creeps in. You puff faster than friends on stairs or feel winded during light activity.

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

Wheezing can occur if the mass partly blocks an airway, causing a whistle-like sound on exhale.

Late signs include heavy bleeding, constant chest pain, or repeated lung infections—an alarm the vessels are leaking or blocking airflow.