In the background, the European ban on British beef exports continues to niggle.
From the economist.com
The only niggle I had with controls was not having easy access to all my weapons.
From the odt.co.nz
Yet, as doubt begins to niggle at Prospero, his vulnerability begins to show.
From the morningstaronline.co.uk
Also listen to your body, and don't be afraid to rest if you've got a niggle.
From the guardian.co.uk
I did a pregnancy test because there was that niggle in the back of my mind.
From the thisisbristol.co.uk
My only niggle is that the stylish back end's small window limit visibility.
From the edp24.co.uk
Once noticed, it actually became quite irritating, the car's first niggle.
From the cars.uk.msn.com
It is concerning that he is the third senior player with an injury niggle.
From the nzherald.co.nz
A faint, very faint niggle of unease had set itself up in the region of his diaphragm.
From the nytimes.com
More examples
Fuss: worry unnecessarily or excessively; "don't fuss too much over the grandchildren--they are quite big now"
Quibble: argue over petty things; "Let's not quibble over pennies"
(niggling) fiddling: (informal) small and of little importance; "a fiddling sum of money"; "a footling gesture"; "our worries are lilliputian compared with those of countries that are at war"; "a little (or small) matter"; "a dispute over niggling details"; "limited to petty enterprises"; " ...
"Leaf by Niggle" is a short story written by J. R. R. Tolkien in 1938-39 and first published in the Dublin Review in January 1945. ...
A minor complaint or problem; Small, cramped handwriting; To trifle with; to deceive; to mock; To dwell too much on minor points; To fidget, fiddle, be restless