Why does pregnancy cause vomiting red things?

Patient's question:

Stomach bloating, nausea, vomiting with red substances at the end

Doctor's answer:

Medical Analysis: Based on the description, it is considered to be severe vomiting caused by early pregnancy symptoms. During pregnancy, the gastric mucosa becomes slightly congested, and combined with the influence of hormones in the body, it leads to severe vomiting, which in turn causes bleeding of the gastric mucosa, resulting in the presence of red substances. Of course, if there is a history of gastritis, the condition may worsen due to pregnancy.
Advice: Due to the severity of the vomiting, it is recommended to temporarily adopt a fasting measure. Necessary energy and electrolytes should be supplemented through intravenous infusion to prevent dehydration. If the gastric bleeding is severe, it may also be necessary to use gastric mucosal protective agents and hemostatic drugs.