What are the health concerns from multiple concussions?

Many: Chronic symptoms and signs from repetitive concussions include: headaches, memory problems, depression, insomnia, difficulty learning, etc. Some now are linking multiple concussions to even more serious brain conditions such as dementia.

Eventual outcomes: Repetitive head injuries can cause Post-Traumatic Encephalopathy, with Alzheimer-like dementia, but also, might promote Parkinson's issues. So, best to avoid multiple concussions, especially by avoiding sports at high risk, such as football, boxing, hockey.

Short vs long term: Short term concerns include acquired attention deficit, memory problems, fatigue and behavioral changes such as increased impulsivity and learning problems. The long term concerns include recently described chronic traumatic encephalopathy and Parkinson disease.