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Telltale Signs You Had COVID Already, Say Experts

What we know about Long COVID so far, according to doctors.

While many people can recover from COVID in a few weeks, "persistent COVID-related symptoms" can be a problem that lasts, for many people, months and even years after even a mild infection, says Dr. Suman Radhakrishna MD FACP, Director of Infectious Diseases at Dignity Health California Hospital Medical Center. Eat This, Not That! Health talked to experts who explained everything to know about it and what the signs are. Read on—and to ensure your health and the health of others, don't miss these Sure Signs You've Already Had COVID.


Common Long COVID Symptoms

Elderly woman feeling unwell,she's headache and painful around chest area.

Dr. Tom Yadegar, pulmonologist and medical director of the intensive care unit at Providence Cedars-Sinai Tarzana Medical Center explains, "A common long COVID-19 presentation that is seen mostly in young to middle-aged otherwise healthy women is persistent shortness of breath, palpitations, and dizziness, a condition known as POTS (Postural Orthostatic Tachycardia Syndrome). Similar to the various immune system complications observed in acute COVID-19, POTS presentations can slightly vary between patients. Unfortunately, many of these symptoms mimic generalized anxiety, and patients, particularly females, suffering from these symptoms are tasked with self-advocacy to elucidate the true etiology behind their condition." Adds the CDC: "People commonly report experiencing different combinations of the following symptoms:

  • Difficulty breathing or shortness of breath
  • Tiredness or fatigue
  • Symptoms that get worse after physical or mental activities (also known as post-exertional malaise)
  • Difficulty thinking or concentrating (sometimes referred to as "brain fog")
  • Cough
  • Chest or stomach pain
  • Headache
  • Fast-beating or pounding heart (also known as heart palpitations)
  • Joint or muscle pain
  • Pins-and-needles feeling
  • Diarrhea
  • Sleep problems
  • Fever
  • Dizziness on standing (lightheadedness)
  • Rash
  • Mood changes
  • Change in smell or taste
  • Changes in menstrual period cycles"


When You Got COVID Matters

Mature woman having heart attack on stairs, outdoors

Dr. Millie Lytle ND, MPH – Head of Coaching for Mymee says, "This question may be easier said than done. Many people think they got COVID between December 2019 and February 2020 when a weird flu was going around, and yet evidence points to the contrary — they have no antibodies, and the authorities say it wasn't here yet. On the other hand, even more people ended up with Long COVID who were exposed to and suffered from the acute illness prior to the development of reliable testing, and have been suffering since the spring and summer of 2020 from a series of symptoms we consider classic to COVID. If you're suffering with a loss of taste and smell, persistent fatigue, heart pounding, shortness of breath, dizziness, buzzing, headaches, inability to exercise and a low grade fever for at least a month or two since having had a virus, even a mild one, you likely had COVID even if you didn't test positive for it."

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Cluster of Symptoms

Woman with breathing problem

Dr. Jagdish Khubchandani, MBBS, Ph.D. Professor of Public Health New Mexico State University explains, "The symptoms differ based on various studies. No set number or types of symptoms are required for diagnosis. Also, no persistence of original symptoms of COVID-19 infection are a prerequisite for having long COVID- symptoms can be entirely new. What is known from studies is that there is never a single symptom, but a cluster of symptoms. Also, broadly, it can be said that long COVID has three symptom categories — respiratory symptoms, symptoms from other body organs (e.g. metabolic, gastrointestinal, nervous system, and others), and general worsening of quality of life as an indicator."

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Long Haul COVID is a Mystery

Doctor nurse in protective face mask listening to breath with a stethoscope suspecting Coronavirus (COVID-19).

"The risk of long COVID is not well predicted," Dr. Khubchandani states. "For example, while we know that obesity, diabetes, smoking, and chronic diseases can cause severe outcomes in people who get the COVID-19 infection, these risk factors have not been well linked with long COVID and even those with no symptoms during infection can have long COVID, making it a mystery."

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Psychiatric Problems

Depressed woman with head in hands

According to Dr. Khubchandani, "Psychiatric problems are also being discussed as one of the most common sequelae of COVID infections, with depression and anxiety being the most common psychiatric issues in the infection survivors. 1-30 percent of individuals report having anxiety and depression symptoms as a part of long COVID." 

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How to Stay Safe Out There

Nurse with face mask sitting at home with senior woman and injecting covid 19 vaccine.

Follow the public health fundamentals and help end this pandemic, no matter where you live—get vaccinated or boosted ASAP; if you live in an area with low vaccination rates, wear an N95 face mask, don't travel, social distance, avoid large crowds, don't go indoors with people you're not sheltering with (especially in bars), practice good hand hygiene, 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.

Heather Newgen
Heather Newgen has two decades of experience reporting and writing about health, fitness, entertainment and travel. Heather currently freelances for several publications. Read more about Heather