Possible causes of numbness at the bottom of the right heel include tarsal tunnel syndrome, nerve compression, lack of blood flow, and diabetes. 1. Tarsal Tunnel Syndrome: The tarsal tunnel is a narrow tube that runs between the ankle bone and the ligaments of the foot. When the tibial nerve, which is located in this canal, is pinched or compressed due to swelling or injury, it can lead to a condition known as tarsal tunnel syndrome, the main symptom of which is numbness in the heel. This condition can be caused by arthritis or foot abnormalities. 2. Nerve compression: Heel numbness can also be caused by nerve compression in other parts of the body. Herniated discs or sciatica, for example, can lead to nerve compression in the lower back and spinal cord, which manifests as numbness in the legs and feet. 3. Lack of blood flow: Often restricted circulation in the veins and arteries can lead to loss of sensation and becoming numb, especially in the parts of the body farthest from the heart. Reduced blood flow may have several causes, such as frostbite, atherosclerosis, peripheral arterial disease, and blood clots. 4. Diabetes: Diabetic neuropathy is a condition that can lead to nerve damage in the hands and feet. This serious condition often affects older people and may occur gradually, with numbness or tingling that is initially faint and gradually worsens over time. If you frequently feel numbness in the heel of your right foot, it is recommended that you seek medical attention to diagnose the cause and treat it.