Foot health can reveal significant underlying health issues, according to podiatrists. Symptoms such as hair loss on toes may indicate vascular insufficiency, while sudden changes in arch height can signal tendon dysfunction, particularly in women over 40. Ingrown toenails that become red and irritated can lead to severe infections if untreated. Other alarming signs include sudden leg swelling, which may indicate deep vein thrombosis, and severe pain in the big toe, a potential sign of gout. Foot drop, characterized by an inability to lift the foot, can result from nerve damage. Regular self-checks for discoloration under toenails are essential, as they can indicate rare skin cancers like subungual melanoma. Prompt medical attention for these symptoms can lead to better health outcomes.