noun
BAD : After the run, I had an ache in my legs.
GOOD : After the run, my legs were aching.
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Ache is usually used either as a verb or in compounds with tooth, ear, head, back, stomach : 'I did some weight training on Monday and my shoulders have been aching ever since.' 'That radio of yours is giving me a headache.'
Compare: 'After the run, I had pains in my legs.'