Normal stomach acid is colorless and clear and can have a sour taste. If there is a change in color and odor, it is mostly due to disease or dietary reasons.
1. Color change: If the stomach acid is yellow, it may be caused by bile reflux. Bile is yellow or yellow-green in color, and when bile reflux mixes with stomach acid, yellowing of stomach acid can occur. If you consume yellow-colored foods and fruits, it can also lead to yellowing of stomach acid. If stomach acid is brown or black, it may be related to peptic ulcer, stomach cancer and other diseases.
2. Change in odor: If stomach acid has fermented odor, it may be related to pyloric obstruction. If stomach acid has ammonia odor, it may be related to uremia.
If there is a change in the color and smell of stomach acid, it is recommended to consult a doctor to analyze the specific cause.