1 Costochondritis. 2  In this condition, the cartilage of your rib cage, particularly the cartilage that joins your ribs to your breastbone, becomes inflamed and painful. 3  Sore muscles. 4  Chronic pain syndromes, such as fibromyalgia, can produce persistent muscle-related chest pain. In this condition, the cartilage of your rib cage, particularly the cartilage that joins your ribs to your breastbone, becomes inflamed and painful. 2  Sore muscles. 3  Chronic pain syndromes, such as fibromyalgia, can produce persistent muscle-related chest pain.
For other uses, see Decibel (disambiguation). The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity. One of these values is often a standard reference value, in which case the decibel is used to express the level of the other value relative to this reference.
[Gram.]. n. adj. nounâ²alâ¢ly, adv. 1  Grammarany member of a class of words that are formally distinguished in many languages, as in English, typically by the plural and possessive endings and that can function as the main or only elements of subjects or objects, as cat, belief, writing, Ohio, darkness.