sentences:  Others may affect many other organs, like HIV, Hashimoto's thyroiditis causing hypothyroidism, or cancer.According to a 2015 report in The American Scholar, an assortment of neglected tropical diseases as well as some recently identified pathogens such as Pseudo-nitzschia have also been found to erode human intelligence.Major depression, affecting about 16% of the population on at least one occasion in their lives and the leading cause of disability in North America, may give symptoms similar to dementia.