Concussion and mild traumatic brain injuries usually result from closed head injuries. Brain injury can even occur in low speed motor vehicle accidents that cause whiplash. These neurological injuries can cause a variety of neurological symptoms that can include dizziness, headache, nausea, memory problems and brain fog as well as endocrine dysfunction by interrupting proper production of hormones like thyroid, adrenal and reproductive hormones. Proper evaluation is critical to identifying the damage and creating a effective plan for improvement.