Despite being classified as a mild TBI, concussions can have serious consequences. Symptoms may not be apparent right away, which makes concussions difficult to diagnose. Individuals who have suffered a blow to the body or head may experience: • Persistent Headaches • Dizziness • Confusion • Nausea And Vomiting • Drowsiness • Irritability • Loss Of Consciousness Though rarer, it is possible for concussions to cause a blood clot on the brain. As with all traumatic brain injuries, this must be taken seriously and treated immediately.