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What makes a person throw up blood if they are sick?

I have had the flu for around 3 days and have been vomiting. Now there has been some blood in my vomit the last couple of times. What does that mean? Why would I be throwing up some blood? Is it normal if you have a bad flu bug?
I am really sorry to hear that you are feeling so badly. I highly recommend that you get in to see your primary care doctor about this issue. They will be able to take a look at you and make sure there is nothing serious going on. Also, assuming not, they can recommend medications for nausea to help you feel better and stop vomiting. Sometimes, with a viral infection like the flu, vomiting may cause small flecks of blood in the vomit. This occurs in large part because the physical strain from vomiting irritates the lining of the stomach leading to a small amount of bleeding. In addition to this, the virus may cause some direct inflammation of the stomach lining which can make the problem worse. Most of the time, this bleeding is not a serious problem that you need to be worried about. However, I am concerned about 3 days of vomiting, as this is very unpleasant and could lead to dehydration. You should see your doctor so that they can give you medications to calm down the nausea! Also, rarely, you may develop more serious stomach bleeding, which would be a medical emergency. Therefore, if you have increasing amounts of blood or clots in the vomit, you need to go to the emergency room right away.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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