What are possible reasons for this feeling in my arm?

When I’m relaxed (most of the time at school) sometimes I’ll get this odd feeling in my arm. It’s hard to describe, but it’s a dull pain, but not really painful. It’s more or less just kind of there. Kind of like if you squish the big vain really hard on the side of your arm closer to your body. It feels like if I were to punch something or jolt it really hard or even tear it open it would feel better. It also happened once in my legs. It’s always both arms and it’s hard to ignore. It takes about 5 to 10 minutes to go away and the time it takes relates to how much I move my arms. Any ideas what this may be a symptom of? Maybe high blood pressure comes to mind?