Please choose the correct ending to complete the given sentence: Health: [header] How to know if you have a hiatal hernia [title] Pay attention to heartburn. [step] The stomach is a very acidic environment because it must mix and break down food while fighting off harmful bacteria and viruses. Unfortunately, the esophagus cannot handle acidic material.

Ending1: A hiatal hernia can cause backflow of food into the esophagus, which results in a burning sensation. Since this occurs near the heart, it's called heartburn. Ending2: This is because the digestive process can limit the energy stored in the esophagus and can block the airways, dilation, and fluid that is absorbing from the esophagus. In order to slow down the process of acid reflux, the stomach consists of one or two carrying particles from one gas to the other. Ending3: A stain at the front of the swallow, a yellowish tint, or foul-smelling-smells the lymph fluid! Its characteristic odor may range from noticeably bad breath to a very foul taste and may indicate diabetes. [substeps] If you experience all of these symptoms, you may have a problem with your esophagus. Ending4: The stomach is at risk of too much acid in a lactating person, along with a duchia. [substeps] The stomach is very risk-monolithic.

Answer format: ending1/ending2/ending3/ending4