Quick description....Sports Injuries, Tendonitis, and Bursitis
The most common cause of sports injury is sudden excessive tension on a tendon or bursa, producing strain or sprain. Repeated muscle contraction, leading to exhaustion of the muscle, can result in similar injury. Sometimes tendinitis develops when the grooves in which the tendons move develop bone spurs or other mechanical abnormalities. Proper stretching and warm-up before exercise are important preventive measures.
Tendonitits is an inflammatory condition of a tendon, usually as a result of a strain. In a large majority of the cases it is a calcific tendinitis of the flexor carpi ulnaris tendon. It's an overuse injury and is the result of bad biomechanics (distribution of the load down the forearm) and also in some capacity a muscle imbalance.
Steroid injections do more harm than good (syringe being the culprit). Anti-inflammatories are suitable for temporary relief but not the most efficacious of treatments.
Only workable solution currently involves 2 stages: (1) a period of rest or cessation of the activities causing pain, followed by (2) a correction of the biomechanics that led to strain in the first place.
I would avoid all forms of standing curls and hammer curls. Standing bar curls because the shoulders have a tendency to be pushed out by the lats and then turn inward to compensate, hence pushing the elbows outward, which actually puts you in a very dangerous position closer to hammer curls. The preacher actually fixes this. Start by using an EZ bar and gripping it such that the index finger falls directly into the first groove. After a few weeks of pain-free you can do olympic barbell preacher with a grip such that the arms are parallel at every stage and the palm is facing directly vertical.
Also, after some time of being pain free, you can do preacher curls on the opposite side of the preacher, to eliminate support. What that does it keep your shoulders and arms into proper biomechanical alignment but removes the pivot support at the elbow, whereas the proper side of the preacher does the same with the pivot support.
You can ice and heat until the cows come home. And you will only be treating the side-effect of the fundamental problem.