There is no antiviral medication or cure for hand, foot and mouth disease (HFMD) in adults. The infection has to run its course, and nearly all people recover in 7 to 10 days with minimal or no medical treatment. What you can do is manage the symptoms, especially the painful mouth sores, stay hydrated, and avoid spreading the virus while you heal.
Adults tend to be caught off guard by HFMD because it’s thought of as a childhood illness. But the same viruses, primarily Coxsackievirus, infect adults too, and the mouth ulcers in particular can be surprisingly painful. Here’s how to get through it as quickly and comfortably as possible.
What to Expect and How Long It Lasts
After exposure, symptoms typically appear within 3 to 5 days. The illness usually starts with a fever and general flu-like feelings: fatigue, sore throat, and body aches. Within a day or two, small red spots or blisters develop on the tongue, gums, and inner cheeks, followed by a rash on the palms of the hands and soles of the feet. Some adults also get blisters on the buttocks or legs.
The entire illness, from first fever to resolution of the rash, generally wraps up in 7 to 10 days. The fever often breaks within the first couple of days, but the mouth sores and skin blisters can linger toward the end of that window. You’re most contagious during the first week, especially while you have a fever, though the virus can shed in stool for weeks afterward.
Managing Mouth Sores
The mouth sores are usually the worst part of adult HFMD. They make eating, drinking, and even swallowing painful, which creates a real risk of dehydration if you stop taking in fluids.
Topical oral anesthetics, available as over-the-counter lozenges or throat sprays, can numb the sores enough to let you eat and drink. Look for products containing ingredients like phenol or menthol. Swishing with warm salt water several times a day also helps reduce pain and swelling. You can make a simple rinse with about half a teaspoon of salt in a glass of warm water.
Over-the-counter pain relievers like ibuprofen or acetaminophen pull double duty here: they lower your fever and take the edge off the oral pain. Ibuprofen’s anti-inflammatory effect can be particularly helpful for swollen, tender sores.
What to Eat and Drink
Cold, soft foods are your best option while the mouth sores are active. Ice pops, smoothies, yogurt, applesauce, and cold soups all go down without much friction. Avoid anything acidic (citrus, tomatoes), salty, or spicy, as these will sting open sores. Very hot foods and drinks also increase discomfort.
Staying hydrated matters more than eating full meals during the worst days. Sip cold water, ice chips, or chilled herbal tea throughout the day. If swallowing is extremely painful, even small, frequent sips are better than nothing.
Caring for the Skin Rash
The blisters on your hands and feet can range from mildly annoying to quite tender, especially on the soles where pressure from walking aggravates them. Leave blisters intact rather than popping them; the fluid inside is sterile and the intact skin acts as a natural bandage. Keep the affected areas clean with gentle soap and water and pat them dry.
If the rash itches, a plain moisturizing lotion can offer some relief. Calamine lotion is another option for itchy spots. For pain on the soles of your feet, cushioned insoles or thick socks can reduce pressure on blisters when you have to walk.
Reducing Fever and Body Aches
Standard over-the-counter pain relievers handle the fever and general achiness well. Rest as much as you can during the first few days when the fever and fatigue are at their peak. Your body is fighting a viral infection, and pushing through it won’t speed recovery.
When You Can Return to Work
There are no formal return-to-work guidelines specific to adults with HFMD, but the general standard used for school and childcare settings applies: you should be fever-free and feeling well enough to function before going back. Keep in mind that the virus spreads through direct contact with blister fluid, saliva, nasal secretions, and stool. Even after you feel better, frequent handwashing remains important because the virus can continue shedding for weeks.
During the active phase of illness, avoid sharing utensils, cups, towels, or anything that touches your mouth or hands. Kiss avoidance is also wise while sores are present.
Cleaning Your Home
The viruses that cause HFMD are hardy on surfaces. To disinfect effectively, use a bleach solution of half a cup of household bleach per gallon of water, prepared fresh each day. Wipe down frequently touched surfaces like doorknobs, light switches, countertops, and bathroom fixtures. Regular hand soap doesn’t kill the virus on surfaces, so bleach or an EPA-registered disinfectant is the better choice.
Wash any contaminated clothing, towels, or bedding in hot water and dry on high heat. If you share a bathroom, clean it daily while you’re symptomatic.
Nail Changes After Recovery
One odd aftereffect catches many adults off guard: fingernails or toenails may loosen or fall off about 4 to 8 weeks after the illness. This condition, called onychomadesis, can happen even on fingers or toes that never had visible blisters. It looks alarming but is painless and temporary. Normal nail growth typically resumes within one to four months, and the nails grow back completely on their own.
Complications in Adults
Serious complications from HFMD are rare in adults. Neurological issues like meningitis or encephalitis have been documented, but they develop very infrequently. Dehydration from not drinking enough due to mouth pain is the most common complication and also the most preventable. If you notice signs of dehydration, such as dark urine, dizziness, or producing very little urine, that warrants medical attention. Similarly, a fever that lasts more than three days or symptoms that worsen rather than improve after the first week are reasons to be evaluated.