The most common signs of COVID-19 are fever, cough, sore throat, congestion, and fatigue. Symptoms typically appear 3 to 6 days after exposure, though the window can stretch from 2 to 14 days. Most people experience mild illness lasting up to 10 days, but the specific mix of symptoms varies from person to person and can shift depending on which variant is circulating and whether you’ve been vaccinated.
The Most Common Symptoms
COVID-19 shares a lot of overlap with the flu and common cold, which is part of why it’s hard to identify by feel alone. The symptoms reported most frequently include:
- Fever or chills
- Cough
- Sore throat
- Congestion or runny nose
- Fatigue
- Muscle or body aches
- Headache
- Shortness of breath or difficulty breathing
- Nausea, vomiting, or diarrhea
- New loss of taste or smell
Symptoms often start mild and can worsen over the first several days. Not everyone gets the same combination. Some people develop only a sore throat and fatigue, while others spike a fever with body aches and a persistent cough. A small number of people infected with the virus never develop symptoms at all but can still spread it.
Loss of Taste and Smell Is Now Rare
In early 2020, losing your sense of taste or smell was one of the most distinctive signs of COVID-19. That has changed dramatically. With current omicron-related variants, the risk of smell loss is only about 6 to 7% of what it was during the initial waves, according to research from Virginia Commonwealth University. Even the alpha and delta variants in 2021 had already reduced the risk to roughly 64 to 74% of the original baseline. If you do lose your sense of smell or taste today, COVID is still a possible cause, but it’s no longer the hallmark symptom it once was.
Digestive and Less Obvious Symptoms
Stomach issues have become more prominent with recent variants. Nausea, vomiting, diarrhea, and belly pain are all reported more frequently with omicron-era strains than with earlier versions of the virus. Some people experience digestive symptoms as their primary complaint, with little or no respiratory involvement, which can make COVID easy to mistake for a stomach bug.
Other less typical signs include trouble sleeping, dizziness, a change in voice, and sore or irritated eyes. Skin changes can also appear during or up to a month after infection. These may look like flat blotches, hives, or small fluid-filled blisters, most often on the arms, legs, or torso. In teens and young adults, swelling and discoloration of the fingers or toes (sometimes called “COVID toes”) has been reported, though this remains uncommon.
How Symptoms Differ in Children
Children with COVID-19 most commonly develop a fever and cough, similar to adults. Sore throat, runny nose, headache, fatigue, and digestive symptoms like nausea and diarrhea are also common. Overall, kids tend to have milder illness than adults, and many recover without complications.
A rare but serious condition called Multisystem Inflammatory Syndrome in Children (MIS-C) can develop 2 to 6 weeks after a COVID infection. It causes a persistent fever along with inflammation affecting multiple organs. More than half of children who develop MIS-C need intensive care. The condition can resemble other serious illnesses, so a fever that won’t break in the weeks following a known or suspected COVID infection warrants prompt medical attention.
How Current Variants Compare
New variants continue to emerge, but the overall symptom profile has stayed relatively stable through the omicron era. Newer subvariants haven’t introduced distinctly different symptoms. The illness generally appears milder now than in the early pandemic years, though experts at Johns Hopkins note this likely reflects stronger population immunity from vaccination and prior infections rather than a less dangerous virus. The incubation period has shortened compared to the original strain: omicron-era variants typically cause symptoms within 3 to 6 days of exposure, whereas earlier strains could take longer.
When to Test and How to Get an Accurate Result
If you develop symptoms that could be COVID, testing right away sometimes produces a false negative because the virus hasn’t built up enough to detect. The FDA recommends two negative rapid antigen tests, taken 48 hours apart, before you can be confident the result is accurate when you have symptoms. If you don’t have symptoms but were exposed, three tests spaced 48 hours apart are recommended. PCR tests are more sensitive but take longer to return results. Testing on the second or third day of symptoms generally gives the most reliable rapid test result.
Signs That Linger: Long COVID
Most people recover from COVID within about 10 days, but a subset develop symptoms that persist for months. The World Health Organization defines long COVID as symptoms that begin within 3 months of the initial infection and last at least 2 months. The most common lingering signs are fatigue, muscle or joint pain, breathlessness, headaches, difficulty concentrating or thinking clearly (often called “brain fog”), and changes in taste. Sleep problems, depression, and anxiety also occur frequently.
Long COVID can follow even a mild initial infection. There’s no single test that confirms it. The diagnosis is typically based on a pattern of symptoms that don’t have another explanation and that started around the time of a COVID illness. If you’re weeks past your infection and still feel significantly off, especially with persistent fatigue or cognitive difficulty, that pattern is consistent with long COVID.