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Sure Signs You've Already Had COVID, According to Doctors

A new study describes the "the long-term health consequences of patients" who had COVID-19.
FACT CHECKED BY Emilia Paluszek

Alongside over 450,000 Americans who have died of coronavirus are those who got the virus and lived—but are maimed by it, their lives ruined. They are called Long Haulers and they suffer Long COVID, or Post-COVID Syndrome, and it happens to an estimated 10% or more of those who get the virus. Now, a new study in The Lancet has been published, aiming to "describe the long-term health consequences of patients with COVID-19 who have been discharged from hospital and investigate the associated risk factors, in particular disease severity," measuring the consequences after six months. Read on to see if you have any of the symptoms, ranked here from less common to most common—and to ensure your health and the health of others, don't miss these Sure Signs You've Already Had Coronavirus


You May Have a Low-Grade Fever

woman covered with plaid checking her body temperature while sitting in bed at her apartment

<1% Suffered This

Some Long Haulers have a consistent fever; temperature fluctuations are not uncommon, as your body thinks it's still fighting the virus. "The degree of temperature elevation might reflect the severity of inflammation," reports a study in Critical Care.


You May Have a Headache

Mature man with bad headache at home

2% Suffered This

Runner and Long Hauler Natalie Hakala "described having a rapid heart rate, brain fog, and consistent headaches unlike any headache she's had before," reports Runner's World. "One sign" she was doing better was that "she can finish her sentences now. Just a few weeks ago, she would have to stop after a few words to catch her breath."


You May Have Myalgia


Woman sitting on the bed with pain in neck

2% Suffered This

Dr. Anthony Fauci, the nation's top infectious disease expert and the director of the National Institute of Allergy and Infectious Diseases, has mentioned myalgia is a common Long Hauler symptom. "Myalgia describes muscle aches and pain, which can involve ligaments, tendons and fascia, the soft tissues that connect muscles, bones and organs," according to Johns Hopkins.


You May Have a Skin Rash

Woman scratching arm indoors

3% Suffered This

"The skin is really a window into how the body is working overall, so the fact that we could visually see persistent inflammation in long-hauler patients is particularly fascinating and gives us a chance to explore what's going on," Freeman told Medscape Medical News. "It certainly makes sense to me, knowing what we know about other organ systems, that there might be some long-lasting inflammation" in the skin as well.


You May Have a Sore Throat or a Difficulty Swallowing

Sick man having sore throat.

4% Suffered This

USA Today tells the story of Diane Matikowski, 61, "a school nurse from Wallingford, Connecticut. Matikowski said she was exhausted for more than three months. Her symptoms also included sore throat, loss of smell and taste, leg cramps and twitches, fevers, a rash, hair loss and memory issues." "I would be watching something on TV and couldn't remember what happened in the last scene," she said. 


You May Have Chest Pain

Young woman and man suffering from heart attack in car

5% Suffered This

This could be a heart issue; many Long Haulers have heart damage. Or an inflammatory issue, like costochondritis. Or it could be a lung issue. "Marina Oshana's antibody test showed that the nasty flu-like illness she had back in February was actually COVID-19," reports FOX40. "My chest started to hurt and I couldn't breathe and I thought, 'This is not right,'" Oshana told the news channel. Now, "I get just out of breath almost immediately," she said.


You May Have Diarrhea or Vomiting

man holding a glass of water

5% Suffered This

Canadian Long Hauler Lauren Nichols has had it rough: "By mid-April, the previously healthy 120 pound 32-year-old with no pre-existing conditions developed walking pneumonia, experienced continued gastrointestinal symptoms, and developed hand tremors in her left hand and numbness in her left foot that lasted two months," reports "After four straight months of nausea, vertigo, and constant diarrhea, she'd lost 12 pounds."


You May Have Dizziness

man massaging nose bridge, taking glasses off, having blurry vision or dizziness

6% Suffered This

"Long haulers also have commonly described neurologic symptoms that include dizziness, headache, loss of smell or taste, etc. Carlos del Rio, at Emory University School of Medicine, wrote in a review that while stroke is not commonly reported acutely with COVID, encephalitis (inflammation of the brain), seizures and 'brain fog' have been described several months post initial infection," reports Scientific American.


You May Have a Taste Disorder

Man taking off face mask for smelling lemon

7% Suffered This

"Among the peculiar and alarming symptoms reported by individuals, who experts call long-haulers, are early signs of Parkinson's disease, scaly skin rashes and unpleasant tastes in their mouths," reports the Miami Herald. Many have lost their sense of taste and, for some, it may never come back.


You May Have a Decreased Appetite

Portrait of man with no appetite in front of the meal

8% Suffered This

A decreased appetite is not uncommon, and hardly the weirdest symptom. "From my Facebook support groups I have heard laments of brain fog, dizziness, twitching eyes, GI issues, heat intolerance, migraines, nausea, neurological deficits, photosensitivity, pleurisy, poor appetite, shortness of breath, loss of taste and smell, tingling, yellow tongue, red toes, blue lips, bulging veins and curled fingernails," Long Hauler Lea Lane writes in Forbes. "My own symptoms now include fatigue, hoarseness, wheezing, fizzy nerves, numb limbs, leg aches, shortness of breath, varying blood pressure from very high to very low, night sweats, insomnia, and a strange buzzing in my body (I was relieved when I realized that many long-haul people also have this frightening feeling)."


You May Have Joint Pain

woman holding her hand

9% Suffered This

Joint pain makes a certain amount of sense. "Most of the symptoms of COVID-19 are a result of an overactive immune system response resulting in cytokines (which are the body's anti-inflammatory cells) to indiscriminately cause inflammation and problems with many or all of the organs in the body," reports Arthritis Rheumatic Disease Specialists. "This is the same mechanism that occurs in many autoimmune disorders such as systemic lupus erythematosus (SLE), vasculitis, rheumatoid arthritis and several other conditions."


You May Have Palpitations

Woman having chest pain and coughing while lying down on sofa at home.

9% Suffered This

Heart issues are all-too-common for Long Haulers. "We absolutely see patients who are in complete recovery or near complete recovery and are thinking that they are in recovery and weeks later come down with symptoms," Dr. Hari Thanigaraj with SSM St. Clare Hospital tells KMOV4 in Chicago. "He says it is typically around 12 weeks after contracting COVID-19 that a patient may start to see symptoms of Post-COVID Syndrome. Those symptoms include dizziness, chest pain, heart palpitations and leg swelling."


You Might Have a Smell Disorder

11% Suffered This

Long Haulers can lose their sense of smell. Or develop an odd disorder. "People suffering from long COVID are reporting a strong smell of fish, sulphur and a sweet sickly odour, as further symptoms of the virus emerge," reports Sky News. "The unusual side-effect is known as parosmia – meaning a distortion of smell – and may be disproportionately affecting young people and healthcare workers."


You Might Lose Your Hair

woman looking in mirror finding gray hair

22% Suffered This

Actress Alyssa Milano, of Charmed and Who's the Boss, is a Long Hauler who experienced hair loss. Her initial symptoms were "stomach issues," "a headache like I've never felt before in my life" and "overwhelming fatigue," she said on the Dr. Oz Show—and then she started losing her hair. "It's hard, especially when you're an actor and so much of your identity is wrapped up in those things like having long silky hair and clean skin," Milano said. She suffered "brain fog" as well. "That's when thinking clearly becomes hard," reports UC Davis Health.


You Might Have Difficulty Sleeping

Depressed woman suffering from headache, lying in bed

26% Suffered This

"Many people's sleep continues to be disrupted by predictable pandemic anxieties," reports the Atlantic. "But more perplexing symptoms have been arising specifically among people who have recovered from COVID-19. "We're seeing referrals from doctors because the disease itself affects the nervous system," Rachel Salas of Johns Hopkins' department of neurology tells the website. "After recovering, people report changes in attention, debilitating headaches, brain fog, muscular weakness, and, perhaps most commonly, insomnia," reports the Atlantic.


You are Most Likely to Have Fatigue or Muscle Weakness

Woman suffering from stomach cramps on the sofa at home.

63% Suffered This

"Post-viral fatigue is completely different to 'normal' tiredness. As well as total exhaustion, people with post-viral fatigue feel generally unwell. It is sometimes seen among patients recovering from other viruses, such as the flu or mumps," says Dr. Sarah Jarvis, Clinical Director of Patient. "Add to this unexplained muscle and joint pain, poor concentration, sore throat, headaches and swollen lymph nodes and it's hardly surprising it can be extremely debilitating."


You Might Have Any One of the Symptoms You've Just Read About

Tired african American male worker or student sit at desk sigh yawn feeling stressed or fatigue overwork in office

76% Suffered This

As the new study found, Long Haulers usually have not just one symptom, but a rotating gallery of them. If you have experienced any of the symptoms mentioned in this article, contact a medical professional immediately. There is no "cure" but doctors can try their best to treat the symptoms—and to ensure you don't get sick in the future, and to protect your life and the lives of others, don't visit any of these 35 Places You're Most Likely to Catch COVID.

Alek Korab
Alek Korab is a Co-Founder and Managing Editor of the ETNT Health channel on Eat This, Not That! Read more about Alek