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.Managing COVID-19 at Home and Recovering From Long COVID
The decisions that matter in COVID-19 are made in the first few days: whether you qualify for antiviral treatment, what to pause to take it safely, and which symptoms mean the illness is no longer mild. Recovery has its own rules, and pushing through them is how a short illness becomes a long one.
Paxlovid: the interaction check comes first
Paxlovid works only when started within five days of the first symptom, so early testing is what makes treatment possible. Its ritonavir component raises the levels of many common medications, so the prescription starts with a review of your list: simvastatin and lovastatin are held for the course, blood thinners such as rivaroxaban and apixaban may need adjusting, and some heart-rhythm and transplant medications cannot be combined at all. A metallic taste is expected. A return of mild symptoms a week or so after finishing, known as rebound, usually clears on its own and is not a reason for a second course.
What to watch at home
A fingertip pulse oximeter is the most useful thing to own during the illness, because oxygen can fall before breathlessness is obvious, particularly in older adults. A reading that keeps drifting down, or that sits in the low nineties at rest, is a reason to call the same day, as are chest pain, confusion, or being unable to keep fluids down. Fever that settles and then returns after several days can signal a bacterial pneumonia layered on the virus. Stay home until you have been fever-free without medication for a full day and symptoms are improving, then keep a mask and some distance for several more days.
Pacing, not pushing, in long COVID
The defining feature of long COVID fatigue is that symptoms worsen a day or two after exertion, the same pattern seen in chronic fatigue syndrome. Graded exercise that ignores that crash makes people worse. Pacing means finding the level of activity that does not trigger it, holding there for weeks, and then increasing in small steps; our long COVID and post-viral fatigue article sets out how. A racing heart and lightheadedness on standing usually reflect a postural tachycardia pattern, covered in our POTS guide, which responds to fluids, salt, compression, and recumbent exercise; Florida heat makes it worse.
What long COVID is confused with
Anemia, hypothyroidism, sleep apnea, and depression are checked for before the label is applied. New or worsening breathlessness months after infection gets lung function testing rather than reassurance. Our cold, flu, COVID, and RSV comparison helps sort out the next respiratory illness.
Vaccination and the next infection
Each infection carries a fresh chance of long COVID, and the updated vaccine is the most reliable way to lower that risk. Vaccination is usually deferred about three months after an infection. People with COPD or heart disease should also keep flu and pneumococcal vaccines current. Our pulmonary team evaluates lingering breathlessness. The NHLBI and the NIH RECOVER initiative publish patient guidance on long COVID.
If you tested positive and take a statin or blood thinner, or symptoms have not resolved three months after infection, schedule a visit.