Generic causes of aches and pains

At work today one of the teachers was talking about how different the various students from various different countries' reactions to the teacher opening the window is. They all think that british people are ridiculously obsessed with getting fresh air (I'm not denying it), but they were split between not caring that the window was open, and having a morbid fear of draughts. I said something about how in Germany mysterious/non-specific aches and pains are usually attributed to draughts, and we wondered what the UK equivalent would be, coming up with "I must have slept on it funny".

What's the generic reason for a small ache/soreness with no apparent reason in other languages/cultures?