Adult projectile vomiting is commonly seen in two major problems, including neurological disorders, digestive disorders, etc. The details are elaborated as follows: 1. Neurological diseases: such as intracranial tumors, intracranial infections and cerebral hemorrhage can have elevated intracranial pressure, and headache, dizziness, nausea and vomiting can occur. Vomiting is mostly projectile vomiting due to elevated intracranial pressure. This situation should be immediately combined with the CT or MRI of the skull and brain, cerebrospinal fluid examination to clarify the diagnosis and give appropriate treatment. 2. Digestive system diseases: For example, if there is obstruction of the digestive tract, such as pyloric obstruction, digestive tract malformation, high intestinal obstruction, etc., due to the inhibition of gastrointestinal downward emptying, the gastrointestinal tract contents can not be excreted normally, causing local obstruction, and the symptoms of violent projectile vomiting appear. In conclusion, the symptoms of projectile vomiting are quite serious and the condition is quite urgent, which should be highly valued, and it is necessary to seek medical treatment as soon as possible, conduct relevant examinations to further clarify the cause of the disease, and take timely therapeutic measures to avoid adverse consequences.