Is it bad to be too hygienic? What happens if you disinfect too much?

Yes, excessive hygiene, particularly personal hygiene, combined with many other factors such as pollution, stress or a sedentary lifestyle, could be responsible for an increase in allergies within the general population.
But ensuring your home is clean by targeting the areas most likely to be contaminated does not equate to excessive hygiene, either of yourself or your environment. This reduces exposure to pathogens and thus prevents the onset of diseases that require drug treatments with potentially disruptive effects. It’s all about balance and common sense when protecting our bodies and intestinal flora, which are often at the frontline.
In the case of a confirmed allergy, eliminating exposure to the allergens in question is the only solution to prevent the onset of symptoms.