I am currently on an anavar only cycle, 80mg/ed. My past three workouts had lead to major headaches that run up the back of my head during my last few reps in a set. I have no idea what could be causeing this, but they hurt pretty good causing me to cut my workouts short. now i have no idea, but i am aware that var can cause some good pump, could I just be straining to hard in the neck area leading to this headache. Any help or advice appreciated, I am going to take a few days off from the gym and see if this helps. My strength is still good and going up, but have to get rid of these headaches during my workout.