I think in the Winter months, our immune system drops dramatically. Lack of Sun , lack of vitamin D, lack of the abundance of FRESH organic local grown veggies and fruits--as compared to heavily sprayed, artificially ripened produce now being sold in the supermarkets, lack of drinking the proper amount of water (because you dont feel that thirst as in Summertime) , the holiday seasons happening now where we all ate too much sugar and other rich foods that impair the immune system, etc,.etc., all tie in to lowering our immune system.

A lower immune system means your going to feel all your mercury symptoms intensify in scale .