That's because it's a big muscle between the ears! :>)
Why do guys do that? Start slowly so you can continue working out. You can't jump from a low level of exercise to a high one without consequences. There is no reason to do it. Exercise is only beneficial if you use your head. You need to work biceps and triceps and all the other opposing muscles in a balanced fashion. When you are done working out, do gentle, slow stretches. The process takes time.
You're spending to much time on the same body part!! Take some aspirin and either soak in a hot tub or apply a heating pad or something like a Ben gay
ointment just be careful to wash your hands don't get the cream in your eyes.
No more than 2-3 sets of 10-12 reps every other day 3 times per week. don't do anything until you're back to normal!!! If within a few days you don't see any
sign of improvement then see your doctor.