 [ Symptoms ] throat hurts growth on feet appear fever too [ Disease ] mostly a hand foot mouth disease it is viral infection and usually takes 7 10 days to heal u can use some analgesics and ointments to ease the case suck on ice or popsicles eat ice cream or sherbet drink cold beverages avoid citrus fruits fruit drinks and soda avoid spicy or salty foods swishing warm salt water around in the mouth may also help relieve the pain associated with mouth blisters and throat sores