Believe it or not, the feet really are the health center of the body. Many serious diseases and health conditions show their first signs and symptoms on the feet. Conversely, proper foot maintenance is extremely important when one already has certain illnesses, such as diabetes. So here’s all you need to know about the symptoms, causes, and treatment of foot disorders, from achilles tendonitis to plantar warts, bunions to toenail fungus and everything in between.