The body excretes toxins primarily through the bowels, urine and skin. Without having a proper bowel movement, the toxins that were sent to be excreted are now reabsorbed into the bloodstream, and recirculate throughout the body.
Lack of adequate fiber in your diet
Dehydration
Food sensitivities: Eating foods that you're reactive or allergic to cause gut inflammation, which can lead to malabsorption and IBS like symptoms.
Reduced hydrochloric stomach acid (toxic overload, illness, heartburn medication)
Slow thyroid activity slows all body processes, including digestive tract movement
Parasitic Infections. While parasites often cause diarrhea, certain infections can also cause constipation in individuals.
Candidia (yeast) overgrowth in the intestines. This can be caused by pharmaceuticals including steroids, antibiotics, oral contraceptives
Small Intestine Bacterial Overgrowth (SIBO) is an overgrowth of bacteria in the small intestine which leads to significant bloating, gas, constipation, and in some cases, diarrhea
Improper gut flora (can be the result of a history of antibiotic use)
Stress
