I feel like 90% of "ancient curses" are probably adequately explained by the fact that the self-proclaimed adventurers who ostensibly fell victim to them were, as a class, a bunch of dipshits who engaged in frequent international travel in an era before antibiotics and vaccines. Like, the list of novel pathogens these guys were risking exposure to on a regular basis was effectively "all of them". That's gotta leave a mark.
@mytheralmin replied:
The other 10%, well let’s just say the sand got them
Quite likely, if by "the sand got them" we mean "they got mesothelioma from inhaling tomb dust".
if you or a loved one has been diagnosed with the pharaoh's curse