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COVID-19 & Long COVID

COVID-19 is a respiratory infection that ranges from mild to severe, and some people develop lingering long COVID symptoms such as fatigue and brain fog lasting weeks to months after infection.

PulmonaryImmunology
COVID-19 is a respiratory infection caused by the SARS-CoV-2 virus. For most people it now causes a mild to moderate illness, but it can still lead to pneumonia, hospitalization, and death — particularly in older adults and people with chronic medical conditions. Some people also develop long COVID, a collection of symptoms that persist for weeks or months after the initial infection clears.

Symptoms

COVID-19 symptoms typically appear two to fourteen days after exposure and vary widely:
  • Fever, chills, and body aches: Similar to influenza.
  • Cough, sore throat, and congestion: Often with a runny nose.
  • Shortness of breath: A warning sign that the infection may be affecting the lungs.
  • Loss of taste or smell: Less common than earlier in the pandemic but still reported.
  • Fatigue, headache, and digestive upset: Nausea or diarrhea occur in some people.

Long COVID

Long COVID refers to symptoms lasting more than about three months after infection. The most common are persistent fatigue that worsens after exertion, brain fog with poor concentration and memory, shortness of breath, palpitations, dizziness on standing, sleep problems, and changes in mood. Symptoms can fluctuate, and anxiety or depression may accompany the physical illness — evaluation for conditions such as generalized anxiety disorder is sometimes part of care. Long COVID can follow even a mild infection, and most people improve gradually over time.

Diagnosis

Home rapid antigen tests and laboratory PCR tests detect an active infection; a negative home test early in an illness does not fully rule it out, so repeat testing a day or two later is sometimes advised. There is no single test for long COVID; it is diagnosed by reviewing symptoms and ruling out other causes such as anemia, thyroid disease, and heart or lung problems with blood tests and, when needed, imaging or breathing tests. A thorough evaluation reassures many patients that no organ damage has occurred, which itself is valuable information for recovery.

Treatment

Most COVID-19 infections are managed at home with rest, fluids, and fever reducers. For people at higher risk of severe disease — including adults over 65 and those with conditions such as diabetes, COPD, heart disease, or a weakened immune system — the oral antiviral nirmatrelvir–ritonavir (Paxlovid) can reduce the risk of hospitalization when started within five days of symptom onset. Long COVID care focuses on the specific symptoms: paced return to activity for fatigue, breathing exercises, sleep support, and treatment of any heart, lung, or mood conditions uncovered during evaluation. Recovery is usually gradual, and setbacks after overexertion are common, so activity is increased in small, steady steps.

Prevention

Staying up to date with recommended COVID-19 vaccination remains the most effective way to prevent severe illness, and it also lowers the risk of developing long COVID. Improving indoor ventilation, washing hands regularly, and staying home while sick protect the people around you. If you are exposed or become ill, testing early matters most for those who qualify for antiviral treatment, because the medication must be started promptly to work.

When to Seek Immediate Care

Call 911 or seek emergency care for trouble breathing, persistent chest pain or pressure, new confusion, inability to stay awake, or pale, gray, or blue lips or skin. If you test positive and may qualify for antiviral treatment, contact your doctor promptly — the window is short. The internal-medicine team at Zimmer Medical Group treats acute COVID-19 and provides step-by-step evaluation of lingering symptoms — schedule a visit if you are not bouncing back after an infection.

Related Medications

Commonly prescribed medications for this condition

Paxlovid

Related resources

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