What Does Persistent Headache After Eating Food Indicate?
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Detailed Answer:
I read your question carefully and I understand your concern.
It is not uncommon for headaches to be triggered by foods. Usually it is not all types of foods which have this effect, only certain ones like chocolate, spices, olives, beans etc, the type of food can vary from person to person. Also alcohol and caffeine can have that effect as well. So you should try to identify what kind of foods trigger the headaches, keep a diary about what you eat and headache, trying removing certain foods to test the difference.
If you've already done that and are sure there is no relation to particular foods then a metabolic cause must be considered like high blood sugar, which is further increased by eating. In that case blood tests must be done to confirm it so a bloodwork is needed.
I remain at your disposal for further questions.
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Detailed Answer:
Thank you for the additional information. I had though that this headache had recurring after eating for some time. Now it seems that it has been present only since Thursday and since you say it not to stop, I wonder whether you're sure it is due to food or rather a persistent headache which might have happened to start after a meal but is not related to it. Because in that other causes must be excluded such as blood pressure abnormality, stroke etc, if persistent for two days and you have no prior history of headache a trip to the ER is justified to look for neurological signs.
If on the other hand the headache subsides and is related only to meals then I would return to the prior hypothesis, I do not think that a blood test done 6 months ago can rule out a headache which has started only two days ago. As I said blood sugar fluctuations (even low sugar) can cause such headache and measurements both before and after eating are necessary to evaluate that.
Also I still would not rule out completely it being related to the type of food. Headache after eating can be a component of celiac disease, sensitivity to gluten present in rye, wheat, barley etc, so which is contained in many of the foods we consume everyday, not only one. Two days history with no other symptoms is not enough to push on that regard though, it is a consideration I am making in case the phenomenon becomes a regular persistent feature.
I hope to have been of help.