Patients with headache, nausea, vomiting and diarrhea are considered to be suffering from the following diseases: The first aspect, which is the most common, is to be considered to be caused by acute gastroenteritis. Patients with this type of attack mostly have obvious triggers, such as eating unclean food, or are easily triggered by excessive diet. Secondly, headache, nausea, vomiting, and diarrhea may also be caused by headache, mainly due to migraine attacks, and patients may have pulsating or throbbing pain on both temporal sides of the head. Thirdly, headache, nausea, vomiting and diarrhea may also be caused by viral colds, because the viral invasion and secretion of toxins stimulates headache, nausea, vomiting and diarrhea.