Encephalalgia

   
Encephalalgia simply menas a headache but it would sound better when you phone in sick! Which reminds me of the Doctor who used to write Plumbum vibrans on sick notes - meaning 'Swinging the lead!

To swing the lead means to malinger. It is said to come from the days when the job of testing the depth of water under a ship was done by raising and lowering a lead on a line. A lazy leadsman would take his time about the process - swinging the lead.