Hi, i wear a neoprene sleeve while working out, if on too tight can it damage your elbows. ?

Yes and no: I don't think that wearing a neoprene sleeve over your elbow that is " too tight" will damage the bones that make up the elbow joint in any way. But it is not good for some of the soft tissues that pass through that area. For example, there are 3 main nerves that run through the elbow area and compression can lead to what is known as a peripheral nerve entrapment syndrome, cubital tumn syndrome