Complications of Hand, Foot, and Mouth Disease
Hand, foot, and mouth disease is usually not serious, and nearly all people get better in 7 to 10 days with no or minimal medical treatment.
Complications from hand, foot, and mouth disease are rare.
Some people, especially young children, may get dehydrated if they are not able to swallow enough liquids because of painful mouth sores. Parents can prevent dehydration by making sure their child drinks enough liquids.
Fingernail and toenail loss
Very rarely, people may lose a fingernail or toenail after having hand, foot, and mouth disease. Most reports of fingernail and toenail loss have been in children. In these reported cases, the person usually lost the nail within a few weeks after being sick. The nail usually grew back on its own. Experts don’t know if hand, foot, and mouth disease caused the nail loss.
Viral (aseptic) meningitis
Although very rare, a small number of people with hand, foot, and mouth disease get viral meningitis. It causes fever, headache, stiff neck, or back pain and may require the infected person to be hospitalized for a few days.
Encephalitis or polio-like paralysis
Very rarely, a small number of people with hand, foot, and mouth disease get encephalitis (swelling of the brain) or paralysis. It is extremely rare.
Pregnant women should contact their healthcare provider if they think they may have been exposed to hand, foot, and mouth disease or think they may have the disease. Although complications from it are rare, patient medical history and how far along a woman is in her pregnancy can affect the situation.