Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: Vicki fluttered her eyes open and was welcomed with an intense pain throbbing in her head . She groaned and rubbed her eyes when she was struck with realisation that she was not in her own bed . She panicked and sat up straight , her foggy brain slowly coming to recognise the room as Henry 's . How did she get here she wondered ?

Question: Why is Vicki 's head potentially throbbing ?
Vicki is hungover .
She might have a headache.