Concussions in Sports discusses concussions, which are mild traumatic brain injuries caused by impacts that cause bruising or swelling of the brain. Symptoms include headaches, memory loss, and mood changes. The NFL and NCAA are researching both short and long term effects of concussions on athletes. Rule changes have targeted helmet-to-helmet hits, and equipment is improving with new helmets reducing concussions by 10% annually. Rest is important to properly treat concussions, which usually heal within 7-10 days but can take longer for athletes.