A chill is the condition of feeling cold and shivering, in such a state, even one put a blanket on, the feeling of coldness stays. This is considered that one has the coldness from the core of the body to the surface of the body, in other words, the movement of the qi is getting weak systemically.
However, shivering means that the body still has power. If one loses the force of body qi, one cannot even shiver. In an extremely strong chill, during the period recovering from it, one sometimes gets fever and sweat on the contrary, but this indicates the body qi is getting stronger, so it is a good phenomenon.
The cause of a chill should be found in the temporally close past, so when one looks back one's daily life, it would be easily understandable. Generally speaking, a chill is one of symptoms of a cold, but one should be careful when it accompanies a pain in the abdomen.
A chill accompanying a pain in the abdomen is the condition when one's energy gets lowered more, so it requires a professional examination and treatment.
*This article is translated from "Yamai hitokuchi Memo" p. 165, written by Shoji Kobayashi, 2005.