Expressing illness

1. Russian expresses 'aches' with the preposition у, the person who aches in the genitive case, and the part of the body that aches in the nominative case:
   У Сергея болит голова.
   Sergei's head hurts.
   У Антона болят ноги.
   Anton's legs hurt.
2. To indicate the illness that someone has, in Russian we use 'to have' expressions with the preposition у, without the word есть:
   У Володи аппендицит.
   Volodya has appendicitis.
   У профессора температура 38,5.
   The professor has temperature of 38.5.