1) Snowboarding - no loss of consciousness but two minutes double vision, one month forgetfulness. 2) Fall on ice, minor 3) Fall skiing, minor 4) Surfing, hit in head with surfboard, ruptured eardrum, cracked molar 5) Surfing, hit in face with board, 5 inch cheek laceration. 6) Two weeks later, biking against my advice (his stupid ER doc friend told him it was okay) - slid and fell wearing helmet, couldn't remember previous two weeks until 30 minutes later in ER
These were spread over a ten year span. Once you've had one concussion, it takes less of a hit to get another.
