Because there are so many different causes of hair loss this is not a simple question to answer. In some situations, like an acute telogen effluvium (sudden shedding of large amounts of hair), simply waiting for the stressful episode to pass will often allow all the hair to regrow. Many hair loss conditions, however, cannot be cured and only treatments are available to improve the symptoms. Finally, when a follicle is permanently lost and completely bald, smooth skin is left, as in male pattern balding, there is no cure or medical treatment that can help. Only a hair transplant can replace the lost hair.