15 Common COVID-19 Symptoms You Should Never Ignore

Coronavirus disease 2019, commonly known as COVID-19, is an infectious respiratory illness caused by the SARS-CoV-2 virus. Since its emergence, it has affected hundreds of millions of people worldwide and continues to circulate in various forms. One of the most important steps in managing the spread of COVID-19 is recognizing its symptoms early. COVID-19 symptoms can range from very mild to severely debilitating, and in some cases, infected individuals may show no symptoms at all (asymptomatic). Understanding the signs of COVID-19 can help you take timely action — such as getting tested, self-isolating, and seeking medical care — to protect both yourself and those around you.

According to the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO), symptoms of COVID-19 typically appear 2 to 14 days after exposure to the virus, with an average onset of around 5 days. Below is a comprehensive list of the most commonly reported COVID-19 symptoms.

1. Fever or Chills

One of the most recognized early symptoms of COVID-19 is a fever. A body temperature of 100.4°F (38°C) or higher is generally considered a fever. It is often accompanied by chills, sweating, and a general feeling of being unwell.

• When it appears: Fever is often one of the first signs of COVID-19, typically appearing within the first 1–3 days after symptoms begin.
• What it feels like: You may feel hot to the touch, experience shivering or shaking, or alternate between feeling very hot and very cold.
• Why it happens: Fever is the body’s natural immune response to fighting off infection. The immune system raises the body temperature to create an environment less favorable for the virus.

It’s important to monitor your temperature regularly if you suspect a COVID-19 infection. Persistent or very high fevers (above 103°F / 39.4°C) warrant immediate medical attention.

2. Cough

A persistent dry cough is one of the most classic symptoms of coronavirus. Unlike a productive cough that brings up mucus, the COVID-19 cough is typically dry and may be continuous or intermittent throughout the day.

• Type of cough: Usually dry and persistent, though some patients may develop a wet cough as the illness progresses.
• Severity: Can range from a mild tickle in the throat to a severe, painful cough that disrupts sleep and daily activities.
• Duration: The cough associated with COVID-19 can linger for several weeks, even after other symptoms have resolved — a common feature in long COVID.

If your cough is severe, causes chest pain, or is accompanied by difficulty breathing, seek medical care promptly.

3. Shortness of Breath or Difficulty Breathing

Shortness of breath (dyspnea) is one of the more serious symptoms of COVID-19 and is a key indicator that the infection may be affecting the lungs. This symptom can develop even in the absence of a severe cough or high fever.

• Mild form: A sensation of breathlessness after light physical activity, like walking up stairs.
• Severe form: Difficulty breathing even at rest, rapid breathing, or visible struggling to breathe — this requires emergency medical attention.
• Why it matters: Difficulty breathing can indicate pneumonia or a significant drop in blood oxygen levels, both of which are serious complications of COVID-19.

⚠️ Warning: If you or someone you know experiences sudden or severe difficulty breathing, persistent chest pain, bluish lips or face, or confusion, call emergency services (911) immediately.

4. Fatigue and Extreme Tiredness

Profound fatigue is a very common complaint among COVID-19 patients. Unlike ordinary tiredness, COVID-related fatigue is often described as an overwhelming exhaustion that does not improve with rest.

• Onset: Fatigue can be one of the first signs of COVID, sometimes appearing even before other symptoms like fever or cough.
• Severity: Some people feel mildly tired, while others are barely able to get out of bed. This is especially common with newer variants.
• Long-term impact: Fatigue is one of the most frequently reported symptoms in Long COVID (Post-COVID Conditions), persisting for weeks or even months after the acute infection.

5. Loss of Taste or Smell (Anosmia/Ageusia)

One of the most distinctive early symptoms of COVID-19 — especially during earlier waves of the pandemic — is the sudden loss of taste (ageusia) or smell (anosmia), often occurring without nasal congestion.

• How it presents: Many patients report waking up one day unable to smell their coffee or taste their food, with no prior warning.
• Duration: For most people, these senses return within a few weeks. However, for others, the loss can persist for months as part of long COVID.
• Why it’s significant: This symptom is considered a hallmark of COVID-19 and can help differentiate it from other respiratory illnesses like the common cold or flu, though it is less common in newer variants such as Omicron.

6. Headache

Headaches are frequently reported among COVID-19 patients across all age groups. COVID-related headaches can vary significantly in intensity and location.

• Character: Often described as a moderate to severe, pressing or throbbing pain that can affect the entire head or concentrate in the forehead and temples.
• Associated features: May be accompanied by light sensitivity (photophobia), eye pain, or neck stiffness.
• Comparison with common headaches: COVID-19 headaches tend to be more persistent and resistant to typical over-the-counter pain relief, and they often worsen with physical exertion.

7. Sore Throat

A sore throat is increasingly reported as one of the new COVID symptoms, particularly with more recent variants of the virus. It is often one of the earliest symptoms to appear.

• Presentation: Patients describe a scratchy, irritated, or painful throat that makes swallowing uncomfortable.
• Comparison with strep throat: Unlike strep throat, a COVID-19 sore throat usually does not present with white patches on the tonsils, though this distinction can be difficult to make without testing.
• Progression: In many cases, the sore throat is short-lived (1–3 days) and may be followed by other respiratory symptoms.

8. Runny Nose or Nasal Congestion

While not one of the original defining symptoms of COVID-19, a runny nose and nasal congestion have become increasingly common, especially with the Omicron variant and its subvariants.

• What it looks like: A constant runny nose, sneezing, or a stuffy, blocked nose similar to what you might experience with a common cold.
• Distinction: This symptom alone can be hard to differentiate from allergies or a cold, which makes testing important for confirmation.
• Frequency: Studies suggest that runny nose is now among the top five most commonly reported COVID-19 symptoms, particularly in vaccinated individuals.

9. Muscle or Body Aches (Myalgia)

Muscle pain and body aches (myalgia) are a common feature of COVID-19, often described by patients as feeling like they have been “hit by a truck.” This symptom reflects the body’s systemic inflammatory response to the virus.

• Location: Pain can affect the muscles of the back, legs, arms, and neck.
• Severity: Ranges from mild soreness to severe, debilitating muscle pain that limits movement.
• Accompanying symptoms: Often occurs alongside fever, fatigue, and headache during the first few days of illness.

10. Nausea, Vomiting, or Diarrhea

Gastrointestinal (GI) symptoms, including nausea, vomiting, and diarrhea, are present in a significant subset of COVID-19 patients. These symptoms can appear alongside or even before the more classic respiratory symptoms.

• Prevalence: Research has found that up to 20–30% of COVID-19 patients experience at least one GI symptom.
• Onset: GI symptoms can be among the early symptoms of COVID, sometimes preceding respiratory symptoms by a day or two.
• Special note: In children, gastrointestinal symptoms tend to be more prominent than in adults. Persistent vomiting or severe diarrhea can lead to dehydration, which requires medical attention.

11. Conjunctivitis (Pink Eye)

Though less commonly discussed, conjunctivitis — also known as pink eye — has been identified as a symptom of COVID-19. The conjunctival tissue (the mucous membrane covering the white of the eye) can become infected and inflamed by the SARS-CoV-2 virus.

• Symptoms: Redness in the whites of the eyes, watery discharge, itching, and light sensitivity.
• Prevalence: Appears in a relatively small percentage of COVID-19 cases but has been noted by the WHO as an associated symptom.
• Transmission note: The eyes can also be a route of virus entry, making eye protection an important consideration in high-risk settings.

12. Skin Rash or “COVID Toes”

Dermatological symptoms have been increasingly documented in COVID-19 patients. One of the most talked-about manifestations is a condition nicknamed “COVID toes.”

• COVID toes: Reddish or purplish discoloration of the toes (and sometimes fingers) that resembles chilblains. It can be accompanied by pain, swelling, or blisters. This symptom is more commonly seen in younger patients and children.
• Other rashes: Some patients develop hives (urticaria), a maculopapular rash (flat and bumpy), or a measles-like rash on the body.
• Timing: Skin symptoms can appear at any stage of the illness and are sometimes the only symptom present in mild cases.

13. Chest Pain or Tightness

Chest pain or a feeling of pressure and tightness in the chest is a concerning sign of COVID-19 that should never be ignored. It can be an indicator of serious complications such as pneumonia, myocarditis (inflammation of the heart), or pulmonary embolism (blood clot in the lungs).

• Presentation: Patients describe a heavy, squeezing, or burning sensation in the chest, sometimes accompanied by difficulty breathing.
• When to seek emergency care: Any new, unexplained chest pain or tightness — especially when combined with shortness of breath, dizziness, or pain radiating to the arm or jaw — is a medical emergency.
• Long COVID: Chest pain is one of the persistent symptoms associated with long COVID, reported by patients weeks or months after the initial infection.

14. Confusion or Brain Fog

Neurological symptoms, including confusion, difficulty concentrating, and memory problems — collectively referred to as “brain fog” — have been widely reported in COVID-19 patients, both during acute infection and as part of long COVID.

• What brain fog feels like: Difficulty thinking clearly, trouble remembering words, inability to focus, mental sluggishness, and feeling “disconnected” from reality.
• Acute confusion: Sudden, severe confusion or altered consciousness in elderly patients or those with severe COVID-19 is a serious warning sign requiring immediate medical attention.
• Long COVID brain fog: Many recovered COVID-19 patients continue to experience cognitive difficulties for months after recovery, significantly impacting their quality of life and ability to work.

15. Dizziness and Lightheadedness

Dizziness and lightheadedness are increasingly recognized as COVID-19 symptoms, affecting patients of all ages. These symptoms may be related to dehydration, low blood pressure, or the neurological effects of the virus.

• Presentation: Feeling unsteady, faint, or like the room is spinning (vertigo). Some patients feel lightheaded upon standing up quickly (orthostatic hypotension).
• Associated symptoms: Often co-occurs with fatigue, headache, and heart palpitations.
• In severe cases: Sudden dizziness combined with other warning signs (such as chest pain or confusion) may indicate a stroke or other serious complication and requires immediate emergency care.

Main Causes of COVID-19

Understanding what causes COVID-19 is essential for prevention and early recognition of the disease.

• SARS-CoV-2 Virus: COVID-19 is caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), a novel coronavirus first identified in Wuhan, China, in late 2019.
• Respiratory droplets and aerosols: The primary route of transmission is through respiratory droplets and fine aerosol particles released when an infected person coughs, sneezes, talks, breathes, or sings. These particles can travel through the air and be inhaled by nearby individuals.
• Close contact: Being in close proximity (within 6 feet / 2 meters) to an infected person for a prolonged period significantly increases the risk of transmission.
• Surface contact (fomites): While less common, the virus can survive on certain surfaces for varying lengths of time. Touching a contaminated surface and then touching the eyes, nose, or mouth can lead to infection.
• Viral variants: Mutations in the SARS-CoV-2 virus have produced multiple variants (e.g., Alpha, Delta, Omicron), some of which are more transmissible and may cause slightly different symptom profiles.
• Weakened immune system: People with compromised immune systems, underlying health conditions, or who are unvaccinated are at higher risk of developing severe COVID-19.

How to Prevent COVID-19

Prevention remains the most powerful tool against COVID-19. The following evidence-based measures can significantly reduce your risk of infection and transmission.

1. Get vaccinated: COVID-19 vaccines are highly effective at preventing severe illness, hospitalization, and death. Staying up to date with recommended vaccine doses and boosters provides the best protection.
2. Wear a mask: In high-risk settings or areas with high community transmission, wearing a well-fitted mask (N95, KN95, or surgical mask) can reduce the risk of inhaling or spreading respiratory droplets.
3. Practice good hand hygiene: Wash your hands frequently with soap and water for at least 20 seconds, especially after being in public places. Use hand sanitizer with at least 60% alcohol when soap is not available.
4. Maintain physical distancing: Keep a distance of at least 6 feet (2 meters) from people who are sick or in crowded, poorly ventilated spaces.
5. Improve ventilation: Open windows, use air purifiers with HEPA filters, and ensure good airflow in indoor spaces to reduce the concentration of airborne viral particles.
6. Avoid crowded indoor spaces: Limit time in crowded, poorly ventilated indoor spaces, particularly during periods of high community transmission.
7. Get tested when symptomatic: If you develop any COVID-19 symptoms, get tested promptly, isolate yourself from others, and follow guidance from local health authorities.
8. Stay home when sick: If you test positive or are experiencing symptoms consistent with COVID-19, stay home and avoid contact with others to prevent further spread.
9. Follow public health guidelines: Keep up to date with recommendations from the CDC, WHO, and your local health department, as guidelines may evolve with new variants and research.

Frequently Asked Questions (FAQ)

What are the first signs of COVID-19?

The earliest signs of COVID-19 typically include fever, fatigue, and sore throat. Some people also experience headache, muscle aches, or a runny nose as initial symptoms. In some variants, loss of taste or smell may appear early. Symptoms can begin as early as 2 days after exposure, though the average onset is around 5 days.

When do COVID-19 symptoms start after exposure?

COVID-19 symptoms typically appear 2 to 14 days after exposure to the SARS-CoV-2 virus, with the average incubation period being approximately 5 days. With newer variants like Omicron, the incubation period may be slightly shorter, sometimes as little as 2–3 days.

What are the 3 new COVID-19 symptoms?

According to updates from health authorities, some of the newer and more commonly reported COVID-19 symptoms — particularly with recent variants — include runny nose, sore throat, and headache. These have become increasingly prominent compared to the earlier hallmarks of fever, cough, and loss of smell.

What are mild COVID-19 symptoms?

Mild COVID-19 symptoms include low-grade fever, fatigue, sore throat, runny nose, mild cough, headache, and muscle aches. Most people with mild illness can recover at home with rest and adequate hydration. However, even mild symptoms warrant testing and isolation to prevent spreading the virus to vulnerable individuals.

How long do COVID-19 symptoms last?

For most people with mild to moderate illness, COVID-19 symptoms last approximately 1 to 2 weeks. Severe cases may take several weeks or longer to recover. Some individuals develop Long COVID, experiencing symptoms such as fatigue, brain fog, and shortness of breath for weeks or months after the initial infection.

Can you have COVID-19 without any symptoms?

Yes. A significant proportion of people infected with SARS-CoV-2 are asymptomatic — meaning they carry and can spread the virus without experiencing any symptoms. This is one of the reasons COVID-19 has been difficult to contain and highlights the importance of regular testing and vaccination.

How is COVID-19 different from the flu?

Both COVID-19 and the flu share similar symptoms like fever, cough, fatigue, and body aches. However, COVID-19 is more likely to cause loss of taste or smell, and can lead to more serious complications such as blood clotting issues and long COVID. The only reliable way to tell them apart is through specific laboratory testing.

What should I do if I have COVID-19 symptoms?

If you develop symptoms of COVID-19, you should: get tested as soon as possible, isolate yourself from others while awaiting results, stay home and rest, monitor your symptoms closely, and contact a healthcare provider — especially if symptoms worsen or you develop warning signs like difficulty breathing or chest pain. Always consult a doctor before taking any medications.

References:

• Centers for Disease Control and Prevention (CDC) – COVID-19 Signs and Symptoms
• World Health Organization (WHO) – Coronavirus Disease (COVID-19)
• Mayo Clinic – Coronavirus Disease 2019 (COVID-19): Symptoms and Causes
• NHS – COVID-19 Symptoms and What to Do
• Johns Hopkins Medicine – Coronavirus Symptoms: Frequently Asked Questions