Which of the following is NOT a symptom of a concussion?

In the context of concussions, a wide range of symptoms can occur due to the brain's response to trauma. Common symptoms include headache, which is frequently reported by individuals suffering from a concussion. Blurred vision is also a recognized symptom, as visual disturbances often accompany concussion. Confusion can manifest as a result of cognitive impairment or disorientation following the injury.

On the other hand, increased strength is not associated with concussions. In fact, a concussion typically results in various challenges affecting physical coordination, balance, and cognitive processing, which can lead to decreased strength or performance rather than an increase. This lack of correlation between concussions and increased strength makes it clear why this option does not belong in the list of typical concussion symptoms. Understanding the common symptoms of concussions helps in recognizing and managing this type of brain injury effectively.