I feel occasional chills when the ac is on full blast, post workout and while sleeping at night and normally as well. I can tell this is not normal as my body tends to sweat a lot otherwise and is a lot warmer otherwise. Had initial level thyroid 6-7 months back which was cured by proper medication and diet. Started feeling kinda the same again..a little bit. What could this be? Could this again be typhoid even after a typhee injection? My diet is quite normal. Please provide help.