hai all experts....

I am staying in a place where the rainy season is not yet started . But it's not hot climate ,  v can stay in rooms even vthout fan.

Sometimes for 5 or 10 minutes I am shivering like anything as if i m in the coldest place of the world. that tym i can heat my heart also shivering.  After that i wiĺ b alrght as befor.
any1 can help me, y this is happening?

it's not regular. Sometimes it happens. All of a sudden it comes and goes