Some professionals estimate that half of all Americans will become hosts to parasites at some point in their lives. Dogs can transmit 65 known parasites to humans, while cats carry about 40 contagious diseases that affect people. Parasites can do an incredible amount of damage without being the obvious cause. For example, those that live in the intestines can cause digestive problems like flatulence, constipation, or diarrhea. They can cause malnutrition by leeching nutrients from their host, resulting in fatigue, apathy, depression, poor memory and concentration.
Parasites can settle in the joints and muscles, form cysts, and create inflammations.
Often the resultant pain is attributed to arthritis. Parasites are able to travel almost anywhere in soft tissue, including the brain. They can form granulomes in the lungs, liver, uterus, and other organs. They produce toxic metabolic wastes that can attack the central nervous system. This can result in restlessness, anxiety, and depression.