The typical four major symptoms of intestinal obstruction are pain, vomiting, bloating, and constipation. Vomiting refers to the urge to vomit; however, it does not mean that every patient with an obstruction must exhibit symptoms of vomiting, as the symptoms vary depending on the location of the obstruction. Obstructions can be categorized into lower and upper types. Upper obstruction may present more apparent vomiting symptoms, while lower obstruction might lead to significant bloating but less obvious vomiting. Therefore, vomiting is not a necessary symptom for the treatment of intestinal obstruction, but it can help in assessing the condition of the obstruction.