Hello dear You have not provided adequate information. Head concussion due to trauma presents variedly and management and treatment is accordingly. If your husband got concussion injury with no loss of consciousness, vomiting, seizure or bleeding through ear or nose then you need not to worry. Even presence of such symptoms with no complains after months are also of no concern. Only late complications of concussion injury may be subdural hematoma presenting as headache, weakness or seizure. If your husband is not having any complain at present and imaging of brain is normal then be positive. If there is presence of any symptoms then do mention in your question again. Hope all comes good God bless you and your family