All Illnesses begin with catching a cold (Kaze wa manbyou no moto). [Annonymous, BC 206]
The wind is believed both to bring life energy and to facilitate development of illnesses. It is just like a body of water can float a boat and simultaneously it can capsize the boat (from Eastern Medicine Proverbs by Tokuko Yamamoto, 1999).
Listening to one's own body carefully, particularly when you feel as if you have a cold, may save medical cost and maybe even precious lives.