Why do i feel nausea? it starts 1 hour after eating and it's gone in 2 hours. no weight loss or vomiting, but occasional hungry pain in stomach.

Too much acid: Could be too much acid is being produced. Peak acid production is one hour after eating. You may need to change your dietary habits. Try smaller meals, less fat, for starters. It could also be an infection like h. Pylori. If it persists and doesnt improve-seek medical attention.

Possibly gastritis: Inflammation in the stomach is a common cause of abdominal pain and nausea. You should see your pcp who would check some basic blood work to see if you have na infection in the stomach. He will also make sure that your liver and kidney function is normal. After appropriate diagnosis the treatment should be easy.

You may have reflux.: Post prandial nausea is what you have and there are many causes. Reflux, stomach ulcers. If your symptoms do not get better with decreaseing the portion size and avoiding spicey foods you should see your primary care physician who can get a better hx than that provided here and perform a physical exam. You may need xrays called an upper GI series. Stool test to look for nonvisible blood. Etc.