How did Xiangxi people distinguish Chinese medicine from diseases in the past?

In the past, Miao villages in western Hunan had their own ancient wives and fathers. When the child has a headache and brain fever, how can he tell whether he is ill or not?

The method is simple. Boil an egg, draw a black line about 10 cm long on the sewing needle, and then stick the needle into the egg. Put the processed eggs under the pillow where the child sleeps. After three days, open the eggs.

Of course, these three days, or according to the condition of treatment.

If the egg goes bad normally, then the child is ill and continues to take medicine. If there is a honeycomb in the egg, it is a trick. Find the trick! Only a juggler can solve it.