Yes, munchkin cats or kittens have serious health issues as compared to other breeds of cats out Here. They are genetically mutated that’s why they have short legs in other words called “dwarf cats or short leg cats” The common health issues are as a result of their mutation, they have bone deformities and others with a hollowed chest.
Also, there is another disease that is common to these breeds that is the Lordosis which means excessive curvature of the spine which affects these breeds. Aside from that these kittens or cats are healthy and active like other cats, they are unable to jump to high places but still manage to jump to where they can reach. It is advisable to put their toys, water, toys, food close where they can reach anytime they want.