The flu, like many other medical conditions, creates significant changes in the body when it occurs. Even if you get the flu shot, you may still come into contact with the virus. When this happens, your body goes into full force to protect against the infection, working hard to fight off the invading illness. As that happens, your body needs to put more energy and reserves towards the illness, often reducing its focus on other tasks, like hair growth. For some people, getting the flu or any serious health condition can result in hair shedding and hair thinning. Could it be happening to you?