Gnawing and starving feeling every 3 hours,what could it be ?endoscopy was fine , thyroid and glicemy are still " normal " i can't avoid to eat .thx

You're probably: overweight and insulin resistant. You're not starving, just hungry due to elevated insulin levels. Try exercising, eating less and losing weight.

Cyclic hunger: An answer specific to you would require more information, including further history and review of data. For general information: People who eat a high carbohydrate diet (particularly if high in sugar & refined grains like refined white flour) frequently experience a rapid drop in blood sugar a couple hours afterwards. This is a trigger for hunger. If all meals are high in carbs, the cycle repeats.