Lack of sufficient love and nurturance in childhood leading to constant emotional insecurities in adult life that undermine normal, healthy immune and glandular functionality.
Poor air and/or water quality as well as insufficient air circulation at home, at work or while traveling / frequent exposure to recirculated air in sealed buildings or aircraft
Chemical contamination of work place and/or home. Persons who handle or inhale chemical fumes / solvents in their work or hobbies.
Damp environments, mold and/or mildew in home, at workplace or in vehicle (ventilation ducts in the home or work place, as well as old car air conditioning systems often harbor considerable mold and mildew colonies, they should be cleaned on as regular a basis as possible. Filters should be changed more frequently than typically recommended).
Insufficient exposure to sunlight.
Living in close proximity to commercial agricultural regions where agricultural chemicals are routinely sprayed.
Living in close proximity to high power electric lines and other electro magnetic field disturbing influences.
Exposure/overexposure (there are no truly safe levels) to ionizing radiation.
Candida infection can be sexually transmitted and is most easily contracted by individuals with lowered immune function.
Individuals infected with HIV / AIDS can, as a consequence of impaired immune function, develop systemic yeast overgrowth.
David B. Schlesinger