It's hard to say. Sometimes if you throw up when there is no food on the stomach, you will vomit bile. It can also indicate dehydration, so be sure you're getting plenty of liquids. If it happens more than once or twice, you really need to see a doctor because it can also be indicative of other more serious things like an intestinal or bile duct obstruction.
I had a similar problem last week, a terribly abdominal pain that left me almost doubled over for several hours before throwing up yellow bile. I went to the doctors the next day was warned it could either be gall stones or appendicitis.
I went for an ultrasound 3 days later and gall stones and an inflammed gall bladder have been confirmed. I am now waiting to sess a specialist to arrange for an operation to remove my gall bladder.
In the interim the doctor has prescribed me with omperazol (to reduce acid stomach) and cocodamol for pain and advised to avoid any fat intake to prevent re-occurence.
Hope this helps - I thought it was just food poisoning and wouldn't have gone to the doctor's if my husband hadn't nagged!
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of Remedy Health Media. Remedy Health Media does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.