Here's an interesting blog post about anger from a therapist named Robert Firestone. Number one in his list of effects of denying or suppressing anger is somaticizing -- creating physical symptoms.
"Holding back angry feelings creates tension, and this stress reaction plays a part in a wide range of psychosomatic ailments, such as headaches, hypertension, cardiovascular disease, and cancer."
Many of us have learned to pooh-pooh what may come along with anger that's held: the constriction, the pain, the frustrating lack of momentum. Ignoring it doesn't make it go away! Among my bodywork clients are some whose hunched neck/shoulders are actually compromising their heart/lung functional capacity --- which compounds with anxiety as the heart races or "I can't breathe!" For some, a holding pattern like this snowballs into a syndrome, a complex tangle of symptoms.
To successfully address physical symptoms, my therapeutic approach will often integrate multiple elements of human experience: emotion, meaning, behavior, sensation, image. Combining Somatic Experiencing with gentle bodywork is what I find most effective.
A few more thoughts about allowing anger to be part of the mix of feelings we experience:
1) Feeling a feeling -- any feeling -- It's not right or wrong, it just is! This is part of the job of our physical bodies. When we sense a feeling, the body gets a message to move. Toward something attractive, away if not attractive. Checking in with where in your body might want to move right now is a great place to start. For example, a nice breath out! -- Aahhh!
2) Feeling an impulse to move is not the same as following through with aggressive actions! To develop more impulse control, experiment with letting go of some control! Sound counter-intuitive? In a Somatic Experiencing session, we might explore feeling that edge between extreme-absolute-control and a-little-bit-of-movement.
3) What's the opposite of anger? Again, not a right or wrong answer here, just an invitation to explore that for a moment, sitting away from your screen to feel whatever it is for you. Give yourself enough time so that when you come back to a feeling of anger, there's this other feeling your body remembers as well. Something to gently swing back to.