After how many concussions does brain damage occur? i've gotten 4 and have started having trouble with things.

Depends: The severity of concussions is more important than the number though brain disorders after repeated mild traumas also been reported you must se a neurologist to assess the situation.

Too many: What people do not understand is that the diagnosis of concussion in itself defines damage to the brain. For most, a single concussion can recover fully or leave you with minimal symptoms. Repeated concussions will result in permanent and irreversible brain damage. If you notice balance problems, headaches, memory and attention problems, mood problems, etc., you have some permanent brain damage.

Yes: A concussion is a form of mild traumatic brain injury. The severity & duration of the symptoms varies on the severity of the hit and the individual. Unfortunately, damage from concussions are cumulative and once you suffer one, you are at risk of more serious consequences from repeat incidences. Please go see a healthcare professional trained in concussion management.