Having tightness in my arms for a week now. the tightness is a bit better, but when i press on the top of my forearm it's very tender. what is it from

Tightness in arms: Recent strenuous activity or trauma? May be tendoinitis , though usually it is one side not both, or thoracic outlet again usually one side . Does it hurt or tingle when you tap on your elbow dimples? that is a sign of ulnar nerve dysfunction).Could be TMJ, cervical spine if had sports history ,autoimmune process-check ESR and CRP, . rarely MS Would,l check electrolytes, CXR, CBC. f/u /w/ doc