A cat vomiting pink liquid may be caused by a viral infection or scratching the intestines by swallowing foreign objects. You can open the cat's mouth first to see if there is anything stuck. If not, take the cat to the pet hospital for examination to confirm the cause of the disease. Get treatment. Regularly deworm and prevent cats to enhance their resistance. You can usually feed cats some probiotics to promote gastrointestinal digestion. When you find cats eating randomly, you should stop them in time to avoid discomfort.