What is an acid
w. h.o. w. a.n. n.a. t. a.l. k.

a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.Often contrasted with alkali and base.

Explanation:

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An acid is a molecule or ion capable of donating a proton, or, alternatively, capable of forming a covalent bond with an electron pair.

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take a break move to stretching and slowly work back into physically exercising if the problem continues go to a doctor or physical therapist