My shower leaked quite badly, whenever I used it then water would drip from the ceiling below. I did my best to seal it up and forgot about it. Then, I was away on holidays for 6 weeks during the cold months here in Ireland. The heating was kept off and there was no natural ventilation in the house. There was quite a bit of mold on the ceiling when I arrived back but nothing horrendous. I cleaned up the surface mold with some bleach as best I could and then painted over it.

There was a very slight musty odour in the house that I masked with fragrances but mostly I forgot about it. Over the next year I started to develop a lot of non-specific symptoms.

I never even considered that the mold could be an issue until I started googling for a really weird symptom that I was having. Everytime I touched something grounded I would get a static shock, it was happening all day long. Anytime I touched a shelf in a supermarket or even if my touched my girlfriend's forehead (depending on the shoes she was wearing and the surface of the floor).

What was happening here was that the serum osmolality was very high (311 mmol/kg). Essentially there were too many electrolytes in my blood and these salts were being excreted onto my skin giving my skin a positive charge. Googling around led me to an interview between Chris Kresser and Dr. Shoemaker who highlighted it as a red flag for people suffering with mold issues.