Best thing i've come up with from projectile vomiting is pyloric stenosis. is that the only cause?

No: The term projectile vomiting has been most commonly associated with pyloric stenosis but it is only a descriptive phrase for forceful vomiting. Many things can also cause forceful vomiting. It depends on age of patient, symptoms associated, fever, etc. Pyloric stenosis is typically in infants < 1 m old, 1st born males and is a progressive non bilious vomiting that leads to electrolyte imbalance.

No: There are other causes. Pylori spasm, peptic ulcer disease, gastroparesis to name a few.

For infants.: For infants under 3 months of age, pyloric stenosis is a common cause of projectile vomiting. Other causes may include severe gastroesophageal reflux and intestinal obstruction.