I threw up blue what does this mean. i have no drank anything blur nor have i eaten anything blue?

Green or blue?: If it could have been green, that color could be due to bile regurgitating into the stomach. It is not feasible to explain blue, if that was the color. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.