careless tourist don't usually pay attention to what damage they could be doing which causes damage to the coral, the breakage of coral colonies and tissue damage can be caused by direct contact such as kicking, touch, walking, stepping, or gear contact
another thing that can cause damage is boat anchors from tourists boats which can cause overturning of colonies and tissues damage
it can cause changes in the marine life by humans feeding the marine life
and last tourist throw trash down into the ocean which can cause all sorts of problems