A break in one or more chest ribs, typically caused by direct impact. Danger includes puncturing the lung.
Step-by-Step Guidance
Have the patient sit down, leaning slightly toward the injured side to optimize lung expansion.

Instruct the patient to hold a soft pillow against the injured side of the chest when coughing or deep breathing.

Have the patient take regular, slow deep breaths to keep the lungs clear, even if it hurts slightly.

Apply a cold pack wrapped in a towel for 15 minutes every 2 hours to calm local intercostal inflammation.

Take the patient to an emergency department to rule out internal bleeding or a collapsed lung.

4 - 6 weeks
Timeline is typical for uncomplicated healing. Always follow doctor guidance.