The first signs appear before the rash

Measles starts with symptoms that look like a cold or flu: fever, cough, runny nose, and red eyes. These symptoms appear 10 to 14 days after exposure to the virus. During this phase, the person is contagious but the disease is not yet recognizable as measles.

A day or two before the rash appears, small white spots with red halos develop inside the mouth on the cheeks opposite the molars. These spots, called Koplik's spots, are a reliable early sign of measles. They look like grains of salt on a red background and typically fade as the rash emerges on the skin.

Key Takeaways

  • Measles begins with fever, cough, runny nose, and red eyes three to four days before any rash appears.
  • Koplik's spots—small white spots inside the mouth—appear one to two days before the skin rash and are a specific sign of measles.
  • The rash starts on the face and hairline, then spreads downward to the trunk and limbs over several days.
  • High fever often peaks when the rash appears and can reach 104°F or higher.
  • Most symptoms resolve within a week or two, though cough may linger longer.

The rash spreads in a predictable pattern

The measles rash appears as small, flat red spots that often have a slightly raised texture. It starts on the face and hairline, typically three to four days after the fever begins. Over the next few days, the rash spreads downward across the neck, trunk, and limbs, reaching the feet by the third or fourth day of the rash.

The spots may merge together in some areas, creating larger patches of redness. The rash is usually itchy but not painful. As it fades, the skin may peel slightly, and the rash typically disappears in the same order it arrived—face first, then moving downward.

Fever and other body-wide symptoms

The fever that accompanies measles is often high, frequently reaching 103°F to 104°F or higher. The fever typically starts when the cold-like symptoms begin and often peaks around the time the rash appears. Some people experience a brief dip in fever when the rash first emerges, followed by another rise.

Along with fever, people with measles commonly report body aches, fatigue, and loss of appetite. Coughing is usually the most bothersome symptom and can be severe and persistent. The cough may continue for a week or more even as other symptoms improve.

Symptoms in children versus adults

Children and adults experience measles similarly, but adults tend to have more severe symptoms overall. Adults are more likely to develop complications such as pneumonia or encephalitis (brain inflammation). Pregnant women who contract measles face increased risk of miscarriage and premature birth.

Infants under one year old who contract measles are at particularly high risk for serious complications. Older adults also experience more severe disease. The rash pattern and timing are the same across age groups, but the intensity of fever and systemic symptoms may vary.

When symptoms suggest a complication

Most people recover from measles without complications, but some develop secondary infections or other problems. Signs that suggest a complication has developed include difficulty breathing, chest pain, severe headache, stiff neck, confusion, or seizures. High fever that does not improve after the rash appears, or fever that returns after initially improving, can indicate a secondary bacterial infection.

Diarrhea and vomiting occur in some cases and may lead to dehydration. Ear infections are common in young children with measles. Any of these warning signs warrant contact with a doctor, as some complications require treatment.

How long symptoms last

The entire measles illness typically lasts 7 to 10 days from the start of fever to recovery. The rash itself is usually present for 4 to 7 days. However, the cough often persists for 1 to 2 weeks after other symptoms have resolved, and fatigue may linger as well.

During the first 8 days of illness—roughly from the start of fever through the first few days of rash—a person with measles is highly contagious. This means the person should remain isolated from others during this window to prevent spread of the virus.

Symptoms that are not measles

Several other illnesses produce rashes and fever that can resemble measles. Rubella (German measles) causes a milder rash that does not follow the same spread pattern. Roseola infantum, common in young children, produces a high fever followed by a rash that appears as the fever breaks. Fifth disease causes a "slapped cheek" appearance and a lacy rash on the trunk and limbs.

Scarlet fever, caused by streptococcal bacteria, produces a fine, sandpaper-like rash and sore throat. Drug reactions can also cause rashes with fever. A doctor can distinguish measles from these conditions based on the pattern of symptoms, the appearance and spread of the rash, and sometimes blood tests or other confirmation.

Frequently Asked Questions

Can you have measles without a rash?

Measles almost always produces a visible rash. In rare cases of severe immunosuppression, a rash may not develop, but this is uncommon. If fever, cough, and red eyes are present without a rash, other diagnoses are more likely.

Is the measles rash contagious to the touch?

The rash itself is not contagious. Measles spreads through respiratory droplets from coughing and sneezing, not through contact with the rash. However, a person with measles is contagious during the entire period when respiratory symptoms are present.

What should I do if I think I have measles?

Contact a doctor or healthcare provider before visiting a clinic or hospital in person, so they can take precautions to prevent spread to others. Describe your symptoms over the phone. Do not visit a waiting room where you might expose others. A doctor can confirm measles through examination or blood tests.

Can measles symptoms appear gradually or do they start suddenly?

Measles symptoms typically develop over a few days rather than appearing all at once. The fever and cold-like symptoms usually come first, followed by Koplik's spots, and then the rash. The progression is fairly consistent across people who contract the virus.

How is measles different from a regular cold or flu?

Colds and flu do not produce Koplik's spots or the characteristic measles rash. Measles fever is usually higher and more persistent. The combination of high fever, the specific white spots inside the mouth, and the distinctive spreading rash pattern distinguishes measles from other respiratory illnesses.