What is is 34c small or medium?

As an AI language model, I cannot perfectly determine what you meant by "34c small or medium." I suspect that you're asking about a bra size, indicating whether 34C is considered small or medium. Here's some information about this:

In the international bra-sizing system, 34C is considered a medium size. The number "34" refers to the band measurement, which is taken around the torso just under the breasts. The "C" cup size indicates that there is a difference of three inches between the band measurement and the measurement around the fullest part of the breasts.

It's essential to remember that bra sizes are not absolute. They can vary depending on the brand, style, and individual body shape. As such, it's always best to try on different bra sizes and styles to find the one that fits best and feels comfortable.