I have religiously gotten a flu shot each year since my time working in hospitals. It has just become habit and I can hardly ask my son to get one if I don't.

This year's flu shot was the least painful of any I have ever had. I had no soreness or swelling at all. I have noticed it varies from year to year. My son also said he was not sore this time.

If getting one, it can help if they pull the muscle out a little bit when injecting. That keeps the injection further from the nerve.

I can't imagine the deep full body aches that go with the flu would be remotely tolerable with CRPS....