I had a head injury when i was 4 im 23 now can that cause me to have hot flashes i sleep with 3 fans and im still hot or i get hot and cold?

Hot Falshes? why: Past head injury is not likely to be the cause of your present problem. At your(young) age there is no good reason to have hot flashes. But it can be a symptom of some metabolic disorder or stressful emotional problem. Therefore I would advise you to seek a medical evaluation by your internist or family physician so that they can check your overall health including your thyroid /metabolic health.