Good sirs, I had this problem as well. I am a mason tender in the summer so this problem coupled with lifting and my job was not acceptable. I went to
see a doctor and his belief was that the tendons were overworked and scar tissue had developed (had the pain for a month until my arms literally ceased up on the job). His recommendation was a physical therapist and immediate cortisone shots in each forearm (4 inches down from the elbow). After the excitement of being stabbed in each arm several times, I went home and rested for a week. The pain was still there so it was time to
see what the therapist had to say.
Now behold, the following is what the therapist told me was wrong and her solution to it. I followed the advice and can now preacher curl with ease. This fix might not work for everyone and is not an "instant miracle cure".
The therapist said that a nerve running through my arm was being agitated/pinched by my inflamed forearms. She told me to stop with any activity that could further damage my arms as they were in need of repair and lots of it. I will give a step by step solution as it was given to me in a numerical order to help clear up my rambling.
1: The muscle was inflamed and needed to be relaxed. With the nerve being pinched, I had no chance of relief and working it further was just going to make it worse. She began a 3 week long process of relaxing the muscles in my arms. After the first week I noticed a huge difference. All she did was massage the muscle to release it from its tense state. No pressure on my nerve = no pain.
2: Now that the muscle had calmed down she began exercises with me to show me how to
prevent this from acting up again. The idea was to strengthen the arm by slowly adding some resistance to it, more and more every time. Lots of this was done at home with the use of
one of those huge rubber bands and holding my arms out in front of me, palms in towards each
other, and rocking my wrists away from each
other while holding the band. My arms felt better and better.
3: Now this step could also be step 1.5, but for the sake of closing with what I now do every day to
prevent this from happening again, I will list it here. STRETCH YOUR FOREARMS! The stretch goes something like this;
Right forearm
-Tilt your head to the left, not extremely but enough to feel the upcoming stretch.
-Right arm down at your side, palm facing behind you
-Fingers are to be extended pointing down
-Move your arm 1 foot away from your body, as if you were starting a jumping jack
-Bend you hand at the wrist to point directly behind you
You should now feel a stretch in your forearm. Be careful not to go crazy with this stretch at first. As you get more comfortable with it, you can intensify it by rotating your entire arm back and up.
This solved my entire arm pain and I do it every time I do anything with my arms. I even do it on off days after I have worked my bi's. So give it a try and
see if it helps. =)