How do you know if you have worms in your stomach?

I've been losing and gaining weight (up and down up and down) for a while now..I've been feeling nausea, I've been coughing a lot, I also feel like it could be my dogs hair in me..what could it be? worms? dog hair? what else?

before I go see a doctor...

Dear blablabla,
Of course head to the doctors ASAP...there is a lot of hype by certain companies that worms are a cause for all types of problems in the body but they fail to say it is rare. We all are host to some parasites but most are good and suppose to be there. See a doctor to clear up any misconceptions you have on this.
Sue...good luck

1 in every 3 people have a form of worms for a amount of time. so don't flip out.

isn't it pretty normal for humans to get worms too? I mean they can't kill you... can they? I think they go away on their own... like when you take a crap they go too.

you might need to see a doctor...worms cant hurt you really bad.. but you can get a little pill that you take for a only about a week that will kill the worms its not harmful and you shouldnt be allergic to it. you can ingest your dogs hair.. or if laying in the floor or staying outside...this is a probable cause for worms.