Symplectic Sums are a useful surgery used to produce new symplectic manifolds. I will describe how the symplectic Kodaira dimension depends on the summands with a special emphasis on the spherical case. Of particular interest is the case of a sphere of self-intersection -4. Symplectic sums along such a sphere are the simplest examples of rational blowdowns, a further surgery technique, for which the change in Kodaira dimension is still not understood.