If you notice these, or blood in your vomit, it recommends seeking “immediate” medical help.
“This is because blood can’t flow through the liver properly, which causes an increase in blood pressure in the vein that carries blood from the gut to the liver (portal vein),” NHS Inform says.
“The increase in blood pressure forces blood through smaller, fragile vessels that line your stomach and gullet (varices).
“These can burst under high blood pressure, leading to internal bleeding, which is visible in vomit and/or stools.
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