There are concussions in rugby, but they're much rarer. There are many rules protecting players, such as not being allowed to go in with the head or shoulders (

There are concussions in rugby, but they're much rarer. There are many rules protecting players, such as not being allowed to go in with the head or shoulders (you must tackle with your arms). You're not allowed to lift players off the ground, or tackle them around either their necks or heads. On occasion players will still land badly or be tackled by multiple opponents. Studies are a bit rarer, but older players doesn't seem to nearly have the same level of issues as players from the NFL.