Sudden vomiting in the fifth month of pregnancy can be considered to be caused by two factors: First, it may be vomiting caused by acute gastroenteritis caused by improper diet and unreasonable dietary structure. Secondly, as the uterus continues to grow and compress the stomach, it will lead to a decrease in stomach capacity, producing symptoms such as indigestion, vomiting and loss of appetite. Generally speaking, no special treatment is needed. Just pay attention to adjusting the diet structure and eat more light, easily digestible liquid and semi-liquid food. Pay attention to nutritional supplements, but do not eat too greasy food. You can drink ginger tea, eat ginger slices or eat acidic food to relieve the symptoms of greasiness and nausea. Medications can be taken such as Hawthorn pills and stomach-healthy tablets to promote digestion.