The sore arm is a small price to pay.IMO.
The pain in my arm lasted a couple of days. My whole family has had the shots (wife + 2 kids) and other than the sore arm(s) there have been no other side effects.

On another note, a buddy of mine (he is in early 30's) who is as healthy as a horse contracted H1N1. At first it started out with the same old symptoms as the regular flu. After about a week or so he was not improving and in fact his symptoms got worse. He was having difficulty catching his breath to the point where he couldn't even get up a set of stairs so he went to the ER. They told him he had H1N1 (duh?). They gave hi Tamiflu and sent him home. After a couple of more days, things did not improve. He started vomitting blood so he went back to the ER. They did blood work and took an x-ray.  He had spots on his lungs and his white cell count was way out of whack. They told him he either had pneumonia or cancer(wow-that's scary). They put him on antibiotics and told him again that if things did not improve within 48hrs to come back to the ER right away. Luckily for him the meds started to clear things up. He is going to follow up with his family doctor to clear up the whole cancer diagnosis thing. As I said he was as healthy as a horse before he got it. Very scary.

Quoted from heinekenlvr

The sore arm is a small price to pay.IMO.
The pain in my arm lasted a couple of days. My whole family has had the shots (wife + 2 kids) and other than the sore arm(s) there have been no other side effects.

On another note, a buddy of mine (he is in early 30's) who is as healthy as a horse contracted H1N1. At first it started out with the same old symptoms as the regular flu. After about a week or so he was not improving and in fact his symptoms got worse. He was having difficulty catching his breath to the point where he couldn't even get up a set of stairs so he went to the ER. They told him he had H1N1 (duh?). They gave hi Tamiflu and sent him home. After a couple of more days, things did not improve. He started vomitting blood so he went back to the ER. They did blood work and took an x-ray.  He had spots on his lungs and his white cell count was way out of whack. They told him he either had phnemonia or cancer(wow-that's scary). They put him on antibiotics and told him again that if things did not improve within 48hrs to come back to the ER right away. Luckily for him the meds started to clear things up. He is going to follow up with his family doctor to clear up the whole cancer diagnosis thing. As I said he was as healthy as a horse before he got it. Very scary.

Wow, scary indeed. If it was cancer, then all H1N1 did is bringing it to light. The flu cannot cause cancer, not like that! But the more likely scenario is pneumonia since a lung infection like H1N1 can lead to a complication like pneumonia. Apparently, most of the people that died in 1918 of the flu died from pneumonia. Luckily, now we have antibiotics to combat it, so hopefully your friend will be fine.

He definitely is on the road to recovery but with two small children and a young wife this will scare the crap out of anybody.