I used to get them from freakin breathing it seemed like. I had my nose quarterized twice which has helped, but not eliminated them. The only aas that seems to agravate them is dbols. Like said above probably from elevated blood pressure.
17aa's do it to me. Dbol especially even at 20mg/day. It was brutal...that and the headaches. I only tolerated it for 3 or 4 days before I stopped running it.