Leopard Gecko screaming at tail

[Veronica]

Screaming is a fear/pain response. Squeaking tends to be anger or discomfort. Is there anything that might be causing that? Is he going into shed maybe? Even something like a reflection in the glass might make him angry

[dangernoodles]

I´d look into all the possibilities.

Originally Posted by Veronica

Screaming is a fear/pain response. Squeaking tends to be anger or discomfort.

It could be because they are being defensive to a reflection in the glass, towards another animal, or even you. (but I doubt that, since 8 months is plenty of time to tame down)

It could be that he has some kind of injury, but it especially hurts when he bends to look at his tail. I´d give him a close examination.

Possible injuries: (I have no clue what your husbandry is, so forgive me if I make any false assumptions.)
-If you use a UTH as a heat source, it could have overheated and burnt him.
-If you use a plastic tub that you cut holes in and did not sand the holes down, it is possible he could have been cut by one of these holes.
-If you use sand for your substrate (calcium sand) it is possible he could have ingested it, leading to impaction.
-If you are using a heat rock as source of heat, its very likely he could have been burnt by the heat rock. (DO NOT USE HEAT ROCKS FOR REPTILES!)
-If its a she, it could be problems with egg binding, although I have no idea how gecko reproduction works.
-If you´ve ruled out all the above possibilities, it could be parasites or prolapse. (Prolapse is a serious health problem where, basically, an internal organ is on the outside their body.)

Can anyone else think of any possibilities?