Strain (injury)
A strain, also known as muscular strain, a pulled muscle, or a torn muscle, was an injury that resulted as a result of muscle damage, usually due to overexertion.

In 2151, Phlox remarked he might have strained a leg muscle while participating in the Borothans' kaana-sah exercise. ()

Some months later, Jonathan Archer feigned pulling a muscle in his back which he claimed to be a holdover from an old water polo injury. ()

In 2154 Charles Tucker III pulled a muscle in his left shoulder as a result of running double shifts in engineering. ()

In 2267, Montgomery Scott pulled a muscle during the reaction to Dr. Leonard McCoy’s serum for a radiation disease that caused premature aging. ()

In 2369, Nella Daren suffered a strain in her upper arm due to excess piano playing with Jean-Luc Picard. ()

In 2371, Kes listed a torn muscle as one of the possible diagnoses of Walter Baxter's arm injury. ()

In 2373, The Doctor monitored a gradual buildup of lactic acid in Kathryn Janeway's extensor muscles during her Nechani endurance ritual. ()

In the month following the commencement of her relationship with Worf in 2373, Jadzia Dax was treated for seven muscle pulls; this was due to the vigorousness of their  life. ()

In 2374, Intendant  claimed she had pulled a muscle in her shoulder exercising in the holosuites. This was a ruse to get the security officer, who was guarding the cargo bay she wished to access, to give her a massage, thus letting his guard down and allowing her to knock him unconscious and gain entry into the bay. ()

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Medical conditions