The permanent psychological trauma of circumcision shortly after birth without anesthesia has not been fully investigated. Nevertheless, many studies show there is significant, long-term psychological harm. A reduction of the oxygen carrying capacity of the blood . These studies have all been done in either military or inner-city hospitals and suffer serious methodological flaws. There is also evidence that circumcision may mask the symptoms of serious urinary tract abnormalities.
More baby boys die from circumcision than men die of penile cancer.
The American Cancer Society has stated that circumcision is of no benefit in protecting against cancer. Studies in Africa have suggested that HIV infections are more common in men with foreskins. These studies did not account for cultural, economic, and religious differences between different groups. Regardless, whether this conclusion could be applied to the United States is debatable, since the United States has one of the highest rates of circumcision in the world as well as one of the most rapid increases in HIV infections. While Japan, Norway, Finland, and Denmark have similar or lower rates of HIV and other STDs than does the US, none of these countries routinely circumcise.