What are hair transplant side effects?

Hair transplant side effects can occur and depend on type of treatment and surgeon.  Side effects from hair loss include:
Scarring- every hair transplant procedure has the risk of scarring.  Strip procedures will create a linear scar, while FUE procedures can create hypopigmentation with removal.  Scarring can be little to none with either procedure and shorter hair styles will benefit from FUE in general.
Unnatural results- Unnatural results can occur with poor angle or direction of hair placement.  A straight line and other obvious signs of a hair transplant should be minimized.  The difference between a surgeon with an artistic eye is telling here.  Patients just thinking hair is all the same are mistaken when they notice hair sticking straight off, poor coverage, weird directionality of hair.
Excessively large visible grafts- The plug look should be avoided and can be if proper placement is utilized and use of 1 hair grafts and multi hair grafts in appropriate locations
Loss of existing hair (shock effluvium)- Overly dense grafting sessions can lead to potential loss of existing hairs.  Graft angle can help here.
Infection- Rare but can occur with any procedure
Cysts- Too deep of placement of hair graft or partial removal of hair transplant grafts
Numbness- Much more common with strip procedures

Hair transplant is generally very well-tolerated, but like any procedure, does have some risks.  Some swelling, crusting (scabs), and mild discomfort are common and should be expected.  Depending on the surgeon's technique, scarring is also a potential concern, and mild bleeding and bruising are also possible.  Some patients will report some numbness or tingling at the surgical sites, and very rarely, patients may temporarily lose some of their normal surrounding hair (a phenomenon known as shock loss).
With that said, most patients do great with very few if any issues after transplant.  Hair transplant has very high patient satisfaction rates with minimal down time.
All the best,

Thanks for your question. Like any medical procedure, hair transplant does have some associated side effects, but hair loss is not one of them. Most side effects are localized and temporary and include bruising, tenderness, redness, and temporary numbness near the treated areas. If you're undergoing a NeoGraft (follicular unit extraction) procedure, some of the transplanted grafts do "shed" in the days following the procedure. This is an anticipated response and will not adversely affect your results. 

With NeoGraft, hair loss is not a side effect, but instead is a natural and needed phenomenon for the success of the hair transplantation. Once the hair follicle has been implanted to the desired area, the grafted hair will remain for a few weeks and then shed. Not all the grafted hair will shed but many will. The new hair growth will begin in approximately 4-6 months and continue to grow normally thereafter. Full results may take up to a year. As the new hair grows in, the results will look natural, healthy, and strong.

Although a lot of people worry about the "shock loss" of the existing hair after hair transplant this is an extremaly rare occurence if things are properly done. First of all we only do FUE procedures to avoid ugly linear scar in the back of the head. Also recent advances in the robotic surgery added ability to perform sites with the robot to avoid injury to existing hair. This is much more precise than human eye

Side effect of a hair transplant surgery can be a "pluggy" look.  This is a technical complication from unskilled doctors and technicians.  You can also have bad scarring both on the donor and recipient area.Fortunately if the results are great, the transplanted hairs do not fall out.Unfortunately if it is a bad result, the transplanted hairs also do not fall out.

Strip method side effect is a linear scar across the back of the head.  With ALL methods, shock loss is possible.  Trauma from the tissues can cause follicles to fall asleep in small patches.  Usually this is temporary and the follicles will awaken in a few weeks to months.  Rarely is this permanent.  Infections are very rare.  "Poor take" of follicles  can occur, and this may be technical, genetic, or combination of both. Fortunately, this is rare too.

Hair Transplants are very safe and we see very few side effects. 

As far as hair loss goes, there is always a chance there may be some temporary "shedding" from the back and sides of the "donor" areas of the head. In some cases there may be acceleration of "weak hair" (telogen hair) which the patient will lose in the near future.

We have incorporated Luce after our hair transplant procedures and have found that this reduces the chances of hair loss.

Common side effects from a hair transplant include swelling, pain, numbness, itching, and local infections.  However, these are usually only temporary and not very severe.  In fact, a hair transplant is considered a "minor outpatient procedure."  One very rare complication is total alopecia of your head when all of your hair falls out.  This is so rare, in fact, that when it does happen it's usually a reportable case.  All in all, a hair transplant is a safe procedure that can be done entirely with local anesthsia. 

Fortunately, there are few side effects with hair transplant surgery.  The ones to be considered are early loss of the grafts from infection, temporary swelling/bruising and visible scar from the donor site.

Dr. ES