Mae pobl mewn rhai grwpiau sydd mewn perygl, gan gynnwys babanod a phlant ifanc, menywod beichiog, a phobl ag imiwnedd gwan, yn wynebu mwy o berygl o gymhlethdodau o ganlyniad i'r frech goch.
People in certain at-risk groups including babies and young children, pregnant women, and people with weakened immunity, are at increased risk of complications from measles.