I recently started lifting again after taking about 3 months off. After my workout at the beginning of the week, I felt fine, but the next morning, the inner part of my elbow would hurt a lot whenever I tried to straighten my arm or curl my arm to the end.
If my elbow is anywhere around 90 degrees, there is not pain. Also, no pain when gripping or turning a knob. Even when lifting something using my arms does not hurt.
Now I'm confused as to what it is since it feels like a tendon hurting (when I massage the painful spots, I can feel the tendon that hurts), but isn't painful in most positions except straight out or all the way curled in. I would go as far as to consider it simple DOMS, but the pain has been persistent for 3 days without change in intensity.