3. Mild shocking (shedding) of existing hair: When there is a “weak” existing hair in the areas of the scalp that is transplanted, occasionally the transplant procedure can cause this mild “shock-like” effect on those hairs, causing “drop out” of those hairs for 3-6 months, after which they roughly grow back. Usually, this side effect is noted in about 1 in 10 patients, and is usually not an issue after the first treatment hair has grown in, since then there is strong, dominant hair over the area.