A new study published in the Annals of Neurology suggests that redheads may carry a gene variant (called MC1R -- so romantic!) that increases the risk of both Parkinson's disease ("PD") and melanoma. The article says that researchers have long known that having either PD or melanoma heightens the chances of developing the other condition, but it's been unclear exactly why that relationship exists.

Results from this new study indicate that the MC1R red-hair / fair-skin gene variant may be to blame.

It doesn't mean that having red hair automatically means that you'll get PD or melanoma, but apparently it does mean "heads-up" about both.