Final answer:
Concussions are a type of brain injury that can be caused by playing sports, especially contact sports like football, soccer, boxing, and hockey. Some symptoms that might indicate an athlete has a concussion include headache, drowsiness, confusion, and loss of balance.
Step-by-step explanation:
Concussions are a type of brain injury that can be caused by playing sports, especially contact sports like football, soccer, boxing, and hockey. Some symptoms that might indicate an athlete has a concussion include headache, drowsiness, confusion, and loss of balance. It is important to take concussions seriously and seek medical attention if any of these symptoms are present.