cat gets sick every month

Tweetie is a 6yrs old short hair tabby. She lived outside for part if her lived. We have had her for 3 yrs.She has had sick every month for a least a year. We thought if was worms but she is still throw up. White cloud liquid not that much. Doesn't anything else have that problem? Help! Thanks

The best way to find out what is wrong with Tweetie is to bring her to a veterinarian.

Have you taken her to the vet?  Do you have any plants in your house?  What sorts of food does she eat? 

Sorry for the questions; but that might help us help you figure out what might be going on.

The vet is the next step.We have an aloe vera and African violet. She doesn't eat either of those. She eats dry cat food as well as wet cat food.She eat variety of tables food but very little. She drinks a lot of water.