A study of 20 volunteers conducted at Nagoya University in Japan associated a higher degree of<unk>  after eating. Lack of hydration during<unk>  is a well known cause of headache and<unk> .<unk> ng at a heavy rate causes blood flow to be taken away from the stomach, causing<unk> . Another possible cause of<unk>  is overhydration. Drinking too much water before, during, or after extreme<unk>  (such as a marathon) can cause<unk> , diarrhea, confusion, and muscle tremors. Excessive water consumption reduces or dilutes electrolyte levels in the body causing hyponatremia.
Exercise-induced nausea
Cyclic vomiting syndrome
Ludwig's angina
Abdominal migraine
Cannabinoid hyperemesis syndrome
Postherpetic neuralgia
Abdominal angina
Hypnic headache