COVID-19 Symptoms and Warning Signs
COVID-19 can cause a wide range of symptoms. The pattern changes as the virus evolves and can overlap strongly with influenza and other respiratory infections, so symptoms alone do not establish the diagnosis.
At a glance
Key points
- Common current symptoms
- Fever · chills · sore throat
- Possible onset
- 2–14 days after exposure
- Diagnosis
- Symptoms alone are not enough
- Emergency signs
- Breathing difficulty · chest pressure · confusion
- Higher-risk people
- Seek testing/treatment promptly
- Longer-term effects
- Long COVID can follow infection
How COVID-19 can present
COVID-19 ranges from infection with few or no noticeable symptoms to serious respiratory and systemic illness. With currently circulating variants, WHO reports fever, chills and sore throat among the symptoms seen most often. CDC also lists cough, shortness of breath, congestion or runny nose, fatigue, headache, muscle aches, nausea or vomiting, diarrhoea, and new loss of taste or smell among possible symptoms.
Symptoms may begin mildly and become more severe. People who are older, have certain underlying conditions, are immunocompromised, or otherwise have a higher risk of severe disease should seek medical advice promptly because antiviral treatment is time-sensitive when indicated.
Comparison
Symptoms by clinical importance
This grouping is for navigation, not diagnosis. A person can have COVID-19 without every symptom listed.
| Group | Examples | What it means |
|---|---|---|
| Common respiratory / systemic | Fever or chills; sore throat; cough; congestion; fatigue; headache; muscle aches | Compatible with COVID-19, but also with other respiratory infections. |
| Other possible symptoms | Shortness of breath; nausea or vomiting; diarrhoea; new loss of taste or smell | May occur alone or with other symptoms; the symptom mix can change by variant and immunity. |
| Emergency warning signs | Trouble breathing; persistent chest pain or pressure; new confusion; inability to wake or stay awake; pale, gray or blue skin/lips/nail beds depending on skin tone | Requires urgent medical assessment. |
Evidence snapshot
What symptoms can — and cannot — tell you
Testing and risk assessment matter because symptom overlap is substantial.
Symptoms cannot distinguish COVID-19 from flu
Influenza and COVID-19 share many symptoms. Viral testing can help determine whether SARS-CoV-2 is present and whether early treatment should be considered.
High-risk patients should act early
When treatment is appropriate, it generally needs to start within the first several days of illness. Do not wait for symptoms to become severe before seeking advice if you are at higher risk.
Symptoms can persist after the infection
Some people develop post-COVID condition, with symptoms such as fatigue, breathlessness, pain, sleep problems or cognitive difficulty continuing beyond the acute infection.
Sources
This page separates current clinical or public-health guidance from historical pandemic material. Recommendations can vary by country and may change as evidence evolves.
- 1. WHO. Coronavirus disease (COVID-19) fact sheet. Source ↗
- 2. CDC. Symptoms of COVID-19. Source ↗
- 3. CDC. Testing for COVID-19. Source ↗
This article is based on trusted medical sources and is awaiting clinician review. It is not a substitute for personalized medical advice.