Causes:
Stress, our high-paced lifestyle, lack of sleep (under 8 hours), insomnia, and lack of exercise (under 20-30 minutes, 3 to 4 times weekly) all contribute to a weakened immune system.
Poor food choices (over-processed, chemically laden products) and nutritional deficiencies (due to dietary and/or processed food choices) also rob the body of essential nutrients necessary for proper function.
Food, chemical, and environmental allergies all take their toll on the immune system as it either over-reacts and/or attempts to deal with these various "invaders". Food sources include diary products, wheat, corn, soy, eggs, and white sugar (see below). Chemical sources include solvents, household cleaning products, pesticides, herbicides, and fungicides, and household off-gasing from drywall, carpets, and construction materials. Environmental sources include outdoor pollution and plant and pollen reactions.
Excessive use of social and pharmaceutical drugs, such as coffee, cigarettes, alcohol, marijuana, and all hard drugs can burden the immune system. Pharmaceutical drugs often strain the lymphatic system, as our body tries to eliminate the potential toxins.
Refined sugars are seen as invaders by the immune system. This triggers a response and strains immune system resources. One gram of sugar can hinder immune system activity for up to 24 hours.
Long term parasitic infestations or Candidiasis (see section) may also be a factor. Usually, causes are chronic and contribute to this ailment over the long-term.
Negative emotions, such as frustration, anger, jealousy, fear, hatred, anxiety, and others, can stress various body systems, included the immune system, compromising its ability to function.