Does beheading hurt?

Yes, but it's over quickly.:)
A medical study in 1983 concluded that no matter how efficient the method of execution, a few seconds of pain is inevitable when losing one's head. The guillotine, considered one of the more "humane" methods, relies on severing the brain and spinal cord after cutting the surrounding tissues. Even so, at least two to three seconds of intense pain cannot be avoided. There are many accounts of the heads of executed people continuing to show movement or expression long after the final blow. One particularly gruesome experiment in 1905 involved a French physician who called out the name of the condemned man in the seconds after decapitation. The response was for the eyelids over the severed head to slowly lift up and then the pupils focused on the doctor before then slowly closing again. The doctor claimed that when he repeated the dead man's name, the same actions took place. It was only at the third attempt that the head gave no response. The exact of amount of pain of course relies on the proficiency of the executioner. When Mary Queen of Scots was beheaded in 1587, the axeman took three attempts to sever the head and even then had to finish the job with a knife.