Theo dõi cảm giác ngứa trong bụng. Theo dõi dấu hiệu phát ban trên người. Chú ý đến cơn đau ở bụng. Chú ý tình trạng sụt cân đột ngột và không lý do. Chú ý tình trạng nôn khan hoặc ho. Quan sát dấu hiệu có máu trong phân.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
If you have worms, you may feel an itching in your abdomen that is not normal. This itchiness occurs because the worms release toxins in your body that your immune system responds to like an allergic reaction. Like the itchiness you feel, another reaction that your immune system will produce is a rash. This is again caused by the toxic fluids that the worms leak into our system that causes a hypersensitive reaction in the form of a rash. The rash will most likely show up as red bumps that might