Final answer:
Brain injuries can occur due to various causes such as trauma, lack of oxygen, or certain medical conditions. They can result in a variety of symptoms depending on the area of the brain that is affected.
Step-by-step explanation:
In the novel Mama the Dr.'s Wife, the character who had a serious brain injury is not explicitly mentioned. However, I can provide information about brain injuries in general.
Brain injuries can occur due to various causes such as trauma, lack of oxygen, or certain medical conditions.
They can result in a wide range of symptoms depending on the area of the brain that is affected. For example, a brain injury to the cerebral cortex may lead to cognitive impairment, while an injury to the motor cortex can cause difficulties with movement.