1. You might have some kind of cancer.
2. You might have an intestinal bug.
3. You might have intestinal parasites.
4. You may have thrown your intestinal biome out of whack from something you ate, or from too much stress.
5. If you have been taking meds of any kind, that can affect your intestinal biome.
Since you are not a doc, and can't do any needed tests yourself, you should have it checked out by your doc.
_________________
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau