Thanks for your question on Healthcare Magic.
I can understand your concern.
By your history and description, possibility of
costochondritis of rib
cartilage is more.
Costochondritis is inflammation of cartilage and bone junction.
When these inflamed structures move (by certain movements like stretching), they produce crunching sound.
No need to worry much for this.
Follow these steps for better symptomatic relief in costochondritis.
1. Avoid movements causing pain.
2. Avoid bad postures in sleep.
3. Avoid heavyweight lifting and strenuous exercise.
4. Sit with proper back and chest support.
5. Apply warm water pad on affected areas.
6. Take painkiller and anti inflammatory drugs.
You will mostly improve with all these in 1-2 weeks.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.