Your child is cranky, running a fever and going through tissues like there's no tomorrow. Advertising Policy Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy Then, they won't eat. Then, you see a rash. And their best friend's mom from daycare calls and says her child hasn't been feeling well either. And now it's all making sense. It might be hand, foot and mouth disease, a common but highly contagious childhood illness that makes its way — very quickly — through households, daycares and schools. "Like most viruses, hand, foot and mouth is fairly contagious," says pediatrician Dana Schmidt, MD. "So, in a daycare or school setting, it can spread very quickly....