backache

n. pain in the back

Back pain (also known "dorsalgia") is pain felt in the back that may originate from the muscles, nerves, bones, joints or other structures in the spine.The pain may be have a sudden onset or it can be a chronic pain, it can be felt constantly or intermittently, stay in one place or refer or radiate to other areas. It may be a dull ache, or a sharp or piercing or burning sensation. The pain may be felt in the neck (and might radiate into the arm and hand), in the upper back, or in the low back, (and might radiate into the leg or foot), and may include symptoms other than pain, such as weakness, numbness or tingling.
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Back·ache n. Discomfort or a pain in the region of the back or spine. [more]Backache - Community and Resources

Noun
1. an ache localized in the back
(hypernym) ache, aching
(hyponym) lumbago, lumbar pain

1
noun
pain which goes on for a time, but is not very acute; he complained of various aches and pains
used with other words to show where the pain is situated: see BACKACHE, HEADACHE, STOMACH ACHE, TOOTHACHE
2
verb
to have a pain in part of the body; reading in bad light can make the eyes ache; his tooth ached so much he went to the dentist