I'm having pain in my left arm and leg but my blood pressure and heart beat is normal and i'm still 18 so what do these symptoms show?

Muscular pain issue: Just muscle stress and strain. Tendonitis or bursitis. Trigger points in the muscles associated with the shoulder that trigger on and automatically turn off and cause pain. A massage person can find them and deactivate them with ease. Some of the triggers can scream so loudly you will think you are dying or having a heart attack.