Bright Twinkling star to the left of Jupiter

There is this Bright reddish twinkling star the left of jupiter, It is a little lower than Jupiter itself. I observed it with my telescope (10 mm eyepiece) and it looked fiery. Can someone tell me what this could be? Thanks!

Without a bit more information, its hard to tell - you didn't say how far from Jupiter and what time you are looking.
If its in the constellation Orion (the one with the 3 stars in a straight line forming Orion's Belt), it is the star Betelgeuse.
If its above that constellation, its the star Aldebaran.

I can't find anything near there in Stellarium, though omicron, xi, mu, nu and epsilon Pisces are close by and all are orange giants around magnitude 4 so maybe those, might also have been Io.

Just telling us what eyepiece you used doesn't really give much information about your equipment.

There isn't anything brighter than 2.0 apt mag anywhere near jupiter.