I had FUE 4 months ago to the date, 2500 grafts total, 800-1000 of those on the crown. Is this common? (Photos)

If surgery is done prematurely some patients can have shock hair loss that is not reversible.  It is best to follow up with your doctor.

It would seem you have suffered some shock loss in the crown (Recipient area). It is typically a temporary phenomenon resolving between 3 and 6 months after surgery. It can be permanent in very rare occasions however. You should begin applying minoxidil 5% twice a day after consulting your operating physician as it may hasten the return of the lost hair. The shock loss is often caused by the trauma of preparing slits during the transplantation process. It can be minimized by making the slits between hair follicles instead of blindly on top of the follicles. Using minoxidil before and after surgery may also be helpful in reducing the incident.Good luck

jstock08,So then the left picture is showing much less hair than the before picture. The best course is to have follow up with your surgeon. Do you feel stubble on light touching of the transplanted area? At 4 months there should be lots. There are many reasons for accelerated hair loss or shock loss, but without being there, or even examining you post-op it would be conjecture.All the best,Bernardino Arocha, MD