Beri-beri and athlete's foot are two entirely different diseases. Beri-beri is a nutritional deficiency disease caused by a lack of vitamin B1 in the body, leading to inflammatory neurological disorders, other neurological diseases, or heart disease. Treatment requires supplementation of vitamin B1, either through injections or orally. On the other hand, athlete's foot is a fungal skin infection, commonly known as "foot fungus." It is caused by a fungal infection of the skin on the feet, leading to congestion, edema, itching, and pain. The treatment for athlete's foot primarily involves the use of antifungal medications, either oral or topical.