There is no necessary link between foot odor and cancer, but foot odor is a fungal infection. It is caused by a decrease in resistance and the fungus acts on the feet and recurrent inflammatory reactions of the skin occur. Therefore, recurrent fungal infections can be induced when the body’s resistance decreases. Cancer is a malignant tumor in the body, which can affect life. Cancer is mainly formed by cell differentiation when the body’s resistance decreases, and malignant tumors and resistance decline have a great relationship. Although there is no direct relationship between foot odor and cancer, there are some indirect relationships. Foot odor is related to the body’s resistance, and cancer is also related to the body’s resistance, which will cause many diseases after the resistance decreases.