Shock loss after a hair transplant

What shock loss is

Shock loss is temporary shedding of your existing hair after a hair transplant. It happens because the surgery disturbs the scalp around the follicles, which can push nearby hairs into a resting phase so they fall out early. The medical term is postoperative effluvium, a form of telogen effluvium.

It usually shows up from a few days to a few weeks after surgery, most often around weeks three to four. In most cases the hair grows back within three to four months. It can be upsetting, because the area can look thinner than it did before surgery for a while, but it is a known and usually short-lived effect.

Shock loss can affect the recipient area, where grafts were placed among existing hair, and less often the donor area at the back and sides of the head.

Shock loss vs normal shedding of transplanted hair

Two different things can happen in the weeks after surgery, and they are easy to confuse.

Both are covered in our results timeline, which shows how they fit into the first year.

Native hair vs transplanted hair

Transplanted hairs come from the back and sides of the head, where follicles are generally resistant to pattern hair loss. When they shed after surgery, the follicle stays in place and grows a new hair. That is normal and not shock loss.

Native hairs in the recipient area are different. Many of them are already affected by pattern hair loss and are becoming finer, a process called miniaturisation. These hairs are the most vulnerable to shock loss. Most regrow, but if some were already close to being lost, they may come back finer or not at all, because pattern hair loss was already taking them.

This is one reason a good plan looks at the hair you have now and the hair you are likely to lose. Our page on whether a hair transplant is permanent explains why native hair loss keeps going after surgery.

How common is shock loss?

Reported rates vary widely, partly because studies define and measure it differently. In one surgeon's series of 2,896 patients, shedding of existing hair in the recipient area was recorded in only three cases and in the donor area in one. A study of 152 FUE patients in Nepal recorded temporary hair fall in 42.76% of patients at two months, although that figure did not separate shock loss from normal shedding of the transplanted hairs.

The practical point is that some shedding in the first months is common, and true shock loss that does not recover is uncommon.

How long recovery takes

Most shock loss recovers within three to four months, both in the recipient area and in the donor area after FUT. Regrowing hairs then need time to gain length, so it can be six months or more before the area looks as it did before surgery.

If shedding keeps going past four months, is patchy, or appears in areas far from the surgery, see your doctor. Hair loss can have other causes, such as illness, stress, thyroid problems or low iron, which a GP or dermatologist can check.

Who is at more risk

Published reviews point to a higher risk in women and in people with advanced miniaturisation. The way the surgery is planned also plays a part.

• Women. Female pattern hair loss usually thins hair across the top rather than creating bald areas, so grafts are often placed among a lot of existing hair. See our female hair transplant page.
• People with advanced miniaturisation. If much of the hair in the recipient area is already fine and weak, more of it is likely to shed.
• Grafting into areas with plenty of existing hair. Placing grafts between native hairs, for example when adding density rather than filling a bald area, puts more existing hair near the surgery.

Younger men whose hair loss is still active can also have a lot of miniaturising hair in the treatment area. That is one of several reasons our page on a hair transplant under 25 suggests caution.

What to do if it happens

If you notice more hair loss than you expected in the weeks after surgery, the first step is not to panic. Take clear photos of the area in good light so you can compare them over the following months, and let your clinic know. Most clinics expect these calls and will want to see you, or your photos, at your next review.

Keep following the aftercare you were given. Gentle washing, avoiding harsh products and protecting your scalp from the sun all help the scalp settle. Avoid trying new hair products or treatments you have read about online without checking with your doctor first, because some can irritate a healing scalp.

Give it time. Because shock loss usually recovers within three to four months, and new hairs then need to grow out at about a centimetre a month, it is normal for the area to look its fullest only well into the first year. If the hair has not started to return by around four months, ask your doctor to reassess the area and look for other causes.

Can shock loss be reduced?

It cannot be ruled out, but the risk can be lowered. Careful technique, including how densely grafts are placed among native hair and how deep the incisions go, matters. Some doctors recommend starting medication to slow further loss before surgery and continuing it afterwards, to help keep native hair stable. That is a decision for your doctor, GP or dermatologist, based on your health and history.

At your consultation, ask how much existing hair is in the planned area, how likely shock loss is in your case, and what the plan is if it happens. Our list of questions to ask covers this, and our risks page puts shock loss alongside the other possible side effects.