Sometimes, dyspepsia is a more sudden, noticeable (acute) sensation. Depending on the cause of the dyspepsia, people may have other symptoms such as a poor appetite, nausea, constipation, diarrhea, flatulence, and belching. For some people, eating makes symptoms worse. For others, eating relieves symptoms.
An X-ray machine is essentially a camera. Instead of visible light, however, it uses X-rays to expose the film. X-rays are like light in that they are electromagnetic waves, but they are more energetic so they can penetrate many materials to varying degrees.
The x-ray machine only emits radiation while it is switched on, and this is only done when it takes a picture. It is switched on for a very short time. An x-ray radiation dose is several thousand times smaller than that required to burn the skin or cause illness. Even the risk of causing cancer is tiny.