A: Your husband may be referring to a pair of studies published in February that examined the potential risks of heading the ball, a common move in soccer. One study, conducted at a British university, found signs of brain damage in a group of professional soccer players, all of whom had decades-long careers. The other study, published by researchers at Albert Einstein College of Medicine in New York, focused on amateur players. The study found an increased risk of concussion both from heading the ball and from accidental contact during a game.
Source : http://www.pantagraph.com/blogs/ask-the-doctors-hard-contact-in-soccer-can-cause-concussion/article_f7eaa3e0-ea4e-5e60-b0fa-87b643d9b9c7.html