My sternum(breastbone cracks often. It doesn't hurt but every now and then it might flex and I feel some pressure. I stretch and it cracks. I am a 25 year old man who went through some weight changes. A couple years back I was almost 280. These days I am 165. Can weight changes affect this. Is this something that is serious or just something that might be because of my weight shifts and how much I exercise?
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