I noticed a bony lump on the top of my left shoulder bone. Not paining but it's grinding when rotate the shoulder. I lift weights. Cause for worry?

Prob AC joint. The AC joint is on the top of your shoulder, about 2 inches from the outside edge. I suspect this is what is bothering you. It is easily irritated by repetitive movement and strain. It would take an exam to know exactly where your problem is. Back off on your lifting and try some ibuprofen. If it doesn't go away, see your doctor.

Related Questions

Hello sir. I noticed a bony lump on the top of my left shoulder bone. It's not paining though. I lift heavy weights in the gym. Should I be concerned?

Probably normal. I would not be concerned if you have no symptoms and there is no change over time, such as becoming larger or developing abnormal skin over the area. Read more...