Mild vomiting does not cause blood in the sputum, while severe vomiting that ruptures capillaries in the stomach or esophagus may cause blood in the sputum. Mild vomiting, such as occasional vomiting, usually does not cause blood in the sputum. However, severe vomiting may cause rupture of the gastric mucosa or oesophageal capillaries, which may result in a small amount of bleeding that mixes with the sputum and is then discharged as blood in the sputum. The blood in the sputum caused by the rupture and bleeding of the gastric mucous membrane due to severe vomiting generally does not have much effect, pregnant women do not need to be too anxious, it is recommended to eat small meals, light diet and rehydration, medication, relief of pregnancy vomiting. The blood in sputum will decrease after the vomiting improves. However, if there is frequent blood in the sputum during the period of vomiting, it is recommended to go to the hospital to check the cause of the sputum.