I switched to injecting twice a week. So I injected in my left thy and it hurt the next day not at the inj site but at my knee it swelled up. Day three it hurt , stiff and swelled up. The fourth day the swelling went down and still a little sore. Day five little swelled and no pain. I injected other thy and have had no pain or swelling.

So was looking for some thoughts of what I did wrong. So I don't do it again