Fever for Five Days With Red Eyes and a Rash: Could It Be Kawasaki Disease?

A fever lasting several days with red eyes and a rash in a young child can be Kawasaki disease, an inflammation of blood vessels that may affect the heart's coronary arteries if it goes untreated. Many other illnesses look similar, so a doctor needs to examine your child rather than wait it out. This article covers the signs doctors look for, look-alike conditions, how it is evaluated and treated, and which symptoms need 911.

Kawasaki disease: what a long fever with red eyes and a rash may suggest

Kawasaki disease is an illness that causes inflammation in the walls of blood vessels throughout the body. MedlinePlus (NIH) describes it as an illness that mostly affects children under age 5, and notes that it can cause lasting heart problems when the coronary arteries are involved. The cause is not fully understood. Several factors, including infections and a child's own immune response, are thought to play a part.

Fever with red eyes and a rash is a classic pattern: a fever that keeps going, eyes that look red, and a rash. None of these alone establishes the diagnosis. Together, and especially in a child who seems unusually irritable or miserable, they are a good reason to have your child examined promptly.

Kawasaki disease is much less common than the everyday viral illnesses that also cause fever and rash. Many children with this combination turn out to have one of those. The reason doctors take it seriously is that the treatment may work best when it is started early, and the heart complications are the part that matters most.

The features doctors look for

There is no single feature that settles the question. Clinicians look for a pattern. Descriptions of the illness, including the MedlinePlus page above, commonly list a fever of five or more days together with most of the following signs. Classic criteria call for four of the five features below along with the fever, and doctors also consider incomplete forms, covered later in this article.

• Red eyes. Both eyes are usually bloodshot, often without much pus or crusting. This differs from typical pink eye from bacteria, where yellow discharge is common.
• Changes in the mouth and lips. Lips may be bright red, dry or cracked. The tongue can look swollen and red with prominent bumps, sometimes called a strawberry tongue.
• A rash. It can appear on the trunk, in the diaper area or on the limbs. It does not look the same in every child.
• Changes in the hands and feet. Palms and soles may turn red and the hands or feet may look puffy. Skin around the fingertips and toes can begin to peel in the weeks that follow.
• A swollen lymph node in the neck. Often on one side. If this is your main worry, our article on swollen lymph nodes in a child's neck covers the many ordinary causes.

Children do not all show every sign at once. Some features come and go, so photos taken on your phone can help the doctor see what you saw earlier in the day.

How many days of fever is too long in a child with red eyes and a rash?

You do not need to wait for a particular number of days before calling. A child with fever and a new rash, red eyes, a cracked lip or marked fussiness can be evaluated earlier, and the doctor can decide whether to watch, test or refer. Days of fever are one piece of the picture, not a countdown you must reach.

Keep a simple written log: the date the fever started, the highest readings you measured, any medicine you gave and when, and the day each new sign appeared. This helps the clinician put the timeline together, which is central to this diagnosis. For general fever guidance, see our article on fever in children.

Incomplete Kawasaki disease in babies and older children

Some children have a fever that lasts several days but show only a few of the classic signs. This is sometimes called incomplete Kawasaki disease. It can occur in young infants, who may have fewer visible features, and the illness can still involve the heart. For this reason, tell the clinician if your child has had an unexplained fever for several days even when the rash or eye redness has been mild or has faded.

What else can look like this

Many conditions cause fever with red eyes and a rash. A clinician sorts through these using the history, the exam and testing:

• Common viral infections. Adenovirus and other viruses can cause fever, red eyes and rash. Ordinary viral illnesses are among the more common explanations for childhood fevers; MedlinePlus: Common Cold describes one everyday example.
• Strep throat and scarlet fever. A sore throat with fever and a sandpaper-like rash may point toward a throat infection. MedlinePlus: Tonsillitis explains how throat infections are evaluated.
• Measles and rubella. These vaccine-preventable infections cause fever and rash. Rubella is described on MedlinePlus. Tell the clinician about your child's vaccination status and any recent travel or exposure.
• Tick-borne illness. If your child has had a tick bite or has been in tick country, mention it, since some tick-borne infections cause fever and rash (see MedlinePlus: Lyme Disease).
• Drug reactions. A new medicine can cause fever and rash. Tell the clinician about everything your child has taken.
• Multisystem inflammatory syndrome in children (MIS-C). This condition, which can follow a COVID-19 infection, can overlap with Kawasaki disease, which is one reason hospital teams look at the whole child rather than one symptom.

Our article on a baby with a rash and a fever covers the broader rash-and-fever checklist. Here, the focus is the pattern that raises concern for Kawasaki disease.

How doctors evaluate a child with suspected Kawasaki disease

No single test confirms the diagnosis. Clinicians combine the history, an examination and testing. This often includes blood tests that look for signs of inflammation and anemia, a urine test, and sometimes a throat swab to look for strep. An echocardiogram, an ultrasound of the heart, is used to look at the coronary arteries. An electrocardiogram may also be done. Because the heart findings can change over time, a doctor may repeat the ultrasound at follow-up visits.

Some children are admitted to the hospital for evaluation and treatment. This can feel alarming, but it allows the care team to monitor your child closely and to treat early if the picture fits.

Treatment and what to expect

When Kawasaki disease is diagnosed, children are typically treated in a hospital. As MedlinePlus describes, treatment usually includes intravenous immunoglobulin, a preparation of antibodies given through a vein, and aspirin. Outcomes vary from child to child, but early treatment may reduce the chance of heart complications. Some children need additional medicines if the fever continues or returns, and the cardiology team decides how long to follow the heart.

A medication caution for parents. Aspirin is usually avoided in children because it has been linked to a rare but serious condition called Reye syndrome, and aspirin labels carry a warning about use in children and teenagers who have viral illnesses. In Kawasaki disease, the specialist team may choose aspirin deliberately and supervise it. Do not give aspirin on your own, and do not change the timing or amount of any medicine the team prescribes. Ask your child's prescriber or pharmacist if you have questions, and read the label on any product before you give it.

Children who receive immunoglobulin may need to delay measles- and varicella-containing vaccines, and aspirin use can matter for influenza and varicella vaccination. Ask the care team about timing for your child. General vaccine information is on MedlinePlus: Vaccine Safety.

The heart is the main concern

The coronary arteries supply blood to the heart muscle. In Kawasaki disease, inflammation may weaken the artery wall and cause it to widen, which is called an aneurysm. Not every child develops this, and many children recover without lasting heart problems, especially when treated early. Children who do have artery changes need regular follow-up with a pediatric cardiologist. Ask the cardiology team what activity limits, if any, apply to your child.

Chest pain together with fainting, trouble breathing, pallor or sweating, or chest pain after a recent Kawasaki diagnosis, can be a sign of a heart problem and needs emergency care.

What you can do while you arrange care

• Call your pediatrician the same day if your child has a fever that continues along with red eyes, a rash, cracked lips or swollen hands and feet. Tell the office you are worried about Kawasaki disease so the nurse can triage appropriately.
• Take clear photos of the rash, eyes, lips and tongue, because signs can fade between visits.
• Offer fluids. Note how many wet diapers or bathroom trips your child has had.
• Do not give aspirin or any aspirin-containing product, including salicylate products such as bismuth subsalicylate, to a child unless the child's doctor prescribes it. Kawasaki disease treatment can include doctor-directed aspirin, but giving it on your own risks Reye syndrome. Ask the doctor before using ibuprofen (Advil, Motrin) if Kawasaki disease is suspected or diagnosed, since ibuprofen may interfere with aspirin's effect on platelets, and do not give ibuprofen to babies under 6 months without medical direction.
• If you use a fever reducer such as acetaminophen (Tylenol), follow the product label for your child's age and ask your pediatrician or pharmacist about the amount; do not work out a dose yourself. Do not give any fever reducer to a baby under 12 weeks without medical direction. A baby under 28 days with a temperature of 100.4°F (38°C) or higher, or any ill-appearing baby under 3 months, should go to the emergency room now, with no home treatment first. For a baby 1 to 3 months old with that temperature, call the pediatrician right away; the baby needs to be examined in person today, and if that cannot happen promptly, go to the emergency room. Fever reducers can ease discomfort but do not prevent or treat Kawasaki disease. Keep a fever log with each temperature and the time of each dose so you can share it, because fever reducers can blur the fever pattern the doctor needs to see.
• Bring a list of any medicines, recent illnesses, tick exposures and vaccines.

A fever reducer may make your child more comfortable, but a lower temperature does not show that the illness is mild. Judge by how your child looks and acts, and by whether the other signs are present.

When to Seek Medical Care