According to the website in their comment it apparently stands for "Tension Myositis Syndrome (TMS)" (https://www.tmswiki.org/ppd/An_Introduction_to_Tension_Myo

According to the website in their comment it apparently stands for "Tension Myositis Syndrome (TMS)" (https://www.tmswiki.org/ppd/An_Introduction_to_Tension_Myositis_Syndrome_(TMS) https://www.tmswiki.org/ppd/An_Introduction_to_Tension_Myosi...)