I Think I Have COVID: What Should I Do?

If you think you have COVID, the first thing to do is take a rapid antigen test and, while you wait for or process the result, start behaving as though you are contagious. That means separating yourself from household members as much as possible, wearing a mask in shared spaces, and calling your doctor or a telehealth provider if you are at higher risk for severe illness. The window for starting antiviral treatment is narrow, so acting quickly matters more than waiting to feel sure.

Figuring Out Whether It Is Actually COVID

COVID symptoms overlap heavily with those of the flu, RSV, and common colds, so you cannot tell by symptoms alone. A large UK surveillance study spanning the 2022–2023 winter found that symptom profiles varied little across SARS-CoV-2, influenza, and RSV, making it genuinely difficult to distinguish them without a test.¹ A sore throat, runny nose, fatigue, body aches, and cough are common to all of these infections. One useful clue: fever is much more common with the flu than with COVID. In a community-based study of respiratory virus cases, about three-quarters of influenza infections involved fever, while only about 17% of COVID cases did.² So if you have a high fever, the flu is actually more likely than COVID, though a test is still the only reliable way to know.

If you have young children at home and are trying to figure out what they caught, the picture shifts a bit. In hospitalized children, RSV tends to cause more dramatic respiratory symptoms than COVID does, including severe cough that wakes them from sleep and significant nasal congestion.³ But again, symptom guessing is unreliable. Test when you can.

How to Test and What the Results Mean

The rapid antigen tests you buy at a pharmacy are convenient, but they are far from perfect. Compared with the gold-standard PCR test, rapid tests catch roughly half to two-thirds of infections overall. One cohort study of people with confirmed infections found that rapid antigen test sensitivity was about 64% compared with same-day PCR.⁴ A CDC-backed surveillance study found an even lower overall sensitivity of about 47% against PCR.⁵ That means a negative rapid test, especially a single one taken early in illness, does not rule COVID out.

Timing matters a lot. Rapid test sensitivity peaks around three to four days after symptoms start, when viral load is highest.⁵ If you test on day one of symptoms and get a negative result, test again a day or two later. Serial testing, repeating the test 24 to 48 hours apart, meaningfully improves accuracy. In one home-testing study, a second test one to two days after the first pushed sensitivity up to roughly 81–85%.⁴ A separate analysis confirmed that serial testing improved sensitivity for both Delta and Omicron variants.⁶

If you are asymptomatic but had a known exposure, be especially skeptical of a negative rapid test. Sensitivity drops sharply in people without symptoms, falling to around 36% in one real-world evaluation.⁷ In that situation, a PCR test or waiting a few days and retesting with an antigen test is more reliable.

On the flip side, rapid tests are very good at confirming infection when they are positive. Their specificity is high, so a positive result almost certainly means you have COVID. Think of rapid tests this way: a positive result is trustworthy, but a single negative result early in illness is not.

Isolating at Home and Protecting Your Household

Once you suspect or confirm COVID, your main goal is to limit spread to people you live with. Household transmission has been one of the most consistent drivers of COVID spread since the pandemic began, and the practical steps to reduce it are straightforward, even if they are not always easy to follow.

The basics that have held up across research:

Separate rooms: Sleep and spend your time in a different room from other household members if at all possible. A cross-sectional study found a negative correlation between the number of rooms per person and the proportion of family members who became infected.⁸ More space per person means fewer transmissions.
Masks in shared spaces: If you have to use the same kitchen or bathroom, wear a well-fitting mask. Masking by the infected person as soon as infection is suspected may help cut secondary infections, and the WHO has recommended that infected individuals and close contacts in vulnerable groups wear medical-grade masks.⁹
Hygiene and cleaning: Wipe down shared surfaces like door handles, light switches, and bathroom fixtures. Stagger mealtimes so you are not sharing the kitchen at the same time as household members.
Ventilation: Open windows when practical. Airflow dilutes viral particles in the air more effectively than surface cleaning.

Many people cannot truly isolate at home, whether because of small apartments, shared bedrooms, or caregiving responsibilities. A UK study found that more than three-quarters of surveyed individuals reported they could not adequately isolate at home.¹⁰ If that describes your situation, do the best you can: masks, ventilation, and bathroom cleaning after every use go a long way even without full room separation.

When to Call a Doctor and What Treatments Exist

For most healthy people under 50, COVID will be an unpleasant but self-limiting illness. You will feel lousy for several days and then recover. Standard over-the-counter remedies, acetaminophen or ibuprofen for pain and fever, fluids, and rest, are the mainstay of at-home care.

The picture changes if you are at higher risk for severe disease. Risk factors include being 50 or older, having diabetes, heart disease, chronic lung conditions, obesity, being immunocompromised, or having other conditions the CDC has identified as increasing severe COVID risk.¹¹ If any of those apply to you, contact your doctor as soon as you test positive, ideally the same day. The reason for urgency is that the main antiviral treatment, Paxlovid (nirmatrelvir/ritonavir), needs to be started within five days of symptom onset to work.

Paxlovid’s benefits are real and substantial for people at risk. In one of the largest observational analyses using U.S. electronic health records, patients treated with Paxlovid within five days of diagnosis had 65% lower odds of hospitalization compared with untreated patients.¹² A separate analysis from the same large dataset found a roughly 73% reduction in mortality risk within 28 days.¹³ Those are large effects that make early treatment genuinely worthwhile.

Other antiviral options exist. Remdesivir, given as an intravenous infusion over three days, is another option for high-risk outpatients. Molnupiravir is an oral alternative. A meta-analysis comparing the two found no statistically significant differences in mortality, hospitalization rates, or time to viral clearance, though remdesivir was associated with fewer side effects.¹⁴ In practice, Paxlovid’s convenience as a pill you take at home gives it a significant edge for most patients.

Paxlovid Rebound

You may have heard about “Paxlovid rebound,” where symptoms or a positive test return a few days after finishing the five-day course. It does happen, and it happens more often with Paxlovid than without treatment. In a prospective study, about 19% of Paxlovid-treated patients experienced symptom rebound, compared with 7% in an untreated control group. Viral rebound (testing positive again) occurred in about 14% of the Paxlovid group versus 9% of controls.¹⁵

Rebound appears to be connected to the timing of treatment. Modeling work suggests that when Paxlovid is started near the time of symptom onset, it can halt the virus’s spread within the body but may not fully eliminate it, leaving enough virus to flare up once the drug is cleared.¹⁶ The rebound is usually mild and does not appear to increase the risk of hospitalization. If it happens to you, treat it as a return to being contagious: resume masking and isolation until symptoms clear and a test turns negative again.

Emergency Warning Signs

Most people recover at home, but COVID can occasionally take a dangerous turn, sometimes quickly. Knowing the warning signs that require urgent medical attention can save your life or a household member’s life.

The single most useful tool for monitoring at home is a pulse oximeter, the small clip-on device that reads your blood oxygen level from your fingertip. A reading at or above 95% is generally normal. Consistent readings below 94%, especially at rest, warrant a call to your doctor. Data from a COVID home-monitoring program found that patients who ultimately needed hospitalization had an average resting oxygen saturation of about 93%, with some as low as 88%.¹⁷ If you are in a high-risk group, picking up a pulse oximeter from a pharmacy when you start feeling sick is a smart move.

Beyond oxygen levels, seek emergency care for any of these:

Difficulty breathing: Not just congestion or a stuffy nose, but genuine difficulty getting enough air, especially at rest or with minimal activity.
Persistent chest pain or pressure: Tightness in the chest that does not go away when you shift positions or cough.
Confusion or inability to stay awake: Mental fogginess is common with fevers, but disorientation or excessive drowsiness that concerns you or someone around you is different.
Bluish lips or face: This signals low blood oxygen and is always an emergency.

If you are alone and worried, err on the side of calling. A brief conversation with a nurse line or emergency department can help you decide whether you need to come in.

People Who Need to Be Extra Careful

Immunocompromised individuals face a different illness trajectory than the general population. Where most people clear the virus within about a week, immunocompromised patients can shed virus for far longer. A case series documented persistent SARS-CoV-2 infection in immunocompromised patients lasting from 30 to over 100 days, with replication-competent virus isolated long after the standard isolation period recommended for healthy individuals.¹⁸ If you are on immunosuppressive therapy, have had an organ transplant, or are undergoing cancer treatment, your isolation period may need to be significantly longer, and decisions about when you are safe to be around others should be guided by your medical team rather than general timelines.

Pregnant and postpartum individuals are another group that warrants specific attention. National clinical evidence taskforces have issued living recommendations covering treatment options during pregnancy, including guidance on remdesivir, corticosteroids, breastfeeding, and skin-to-skin contact with newborns.¹⁹ If you are pregnant, talk to your obstetrician about which treatments are appropriate. Breastfeeding is generally encouraged even during acute COVID, with mask use and hand hygiene as precautions.

Does Early Treatment Reduce the Risk of Long COVID?

This is one of the questions people care about most, and the evidence is honestly less encouraging than you might hope. Two large analyses using the same massive U.S. health records database examined whether Paxlovid treatment during acute infection lowered the risk of developing long COVID (sometimes called PASC). The headline finding from both: Paxlovid did not significantly reduce the overall risk of long COVID.²⁰²¹

Dig into the subgroups, though, and some nuance appears. Paxlovid showed a small protective effect against cognitive symptoms and fatigue specifically. And in older adults, the picture looked better: patients aged 65 and older who took Paxlovid had a modest reduction in overall long COVID risk, with one study estimating about a 16% reduction in non-hospitalized patients aged 60 to 75 and another finding a roughly 8% reduction in those 65 and older.²¹²⁰ Those effects are real but small, and they apply mainly to people already at elevated risk due to age or multiple health conditions. If you are 35 and otherwise healthy, the current evidence does not suggest Paxlovid will meaningfully change your long COVID odds.

Interestingly, one of those studies found an unexpected wrinkle: Paxlovid was associated with a nearly twofold increase in long COVID symptoms affecting the eyes and ears, like tinnitus and blurred vision.²¹ This was one finding from one observational study, so it needs replication, but it is a reminder that the relationship between antivirals and long COVID is more complicated than “treat early, avoid long-term problems.”

The Cost Problem

One obstacle that does not get enough attention is that antiviral treatment has become harder to access for many people since the end of government-funded free COVID treatments. When out-of-pocket costs for antivirals increased, prescribing rates dropped substantially. An analysis of prescription patterns found that antiviral prescriptions per 100 patients fell from about 17.5 during the free-treatment period to 11.5 afterward, a decline of roughly 34%.²² That is a meaningful gap, and it likely means some people who would benefit from treatment are not getting it because of cost.

If you are uninsured or underinsured and test positive, it is still worth calling your doctor or a telehealth provider to ask about your options. Manufacturer assistance programs, state-level programs, and community health centers may still offer access. Paxlovid’s wholesale cost is high enough that paying out of pocket is unrealistic for many people, but not all routes to getting it require full retail pricing. The conversation is worth having, especially if you are in a high-risk group where the hospitalization-prevention benefit is largest.

Managing Symptoms at Home

While antiviral treatment targets the virus itself, most of what makes COVID miserable responds to standard comfort measures. Acetaminophen and ibuprofen handle fever and body aches. Staying hydrated matters more than it sounds, especially if fever or reduced appetite means you are taking in less fluid than normal. Honey in warm water or tea can soothe a sore throat and cough as effectively as many over-the-counter cough medicines for mild symptoms.

Various home remedies have gained popularity around the world. An integrative review found widespread use of plant-based preparations in several countries, including ginger, turmeric, garlic, and vitamin C-rich fruits, often consumed as warm teas or mixed with honey.²³ None of these have been shown in rigorous trials to treat or prevent COVID specifically, but some, like ginger tea with honey, are genuinely soothing for sore throats and nausea. The risk with home remedies is not that they are harmful (most are harmless in normal amounts) but that they sometimes delay people from seeking actual medical treatment when they need it. If you are in a high-risk group, home remedies are fine alongside antiviral treatment, not instead of it.

The Mental Health Side of Being Sick

Something people rarely talk about when giving COVID advice is how anxious and isolated the experience can make you feel. Being sick is stressful. Being sick while separated from family members in your own home, worried about whether your symptoms might worsen, and uncertain about when you will feel normal again adds a psychological layer that goes beyond the physical illness. A systematic review of COVID’s long-term mental health effects found that the pandemic broadly worsened psychiatric symptoms in the population, though direct infection itself was generally associated with mild or no lasting mental health effects in most people.²⁴

During acute illness, some practical things help. Stay in contact with friends and family by phone or video even while isolating physically. Keep a loose routine rather than lying in bed doom-scrolling symptom timelines. If you live alone, set up a check-in system with someone who will call or text you at set times. Anxiety about worsening symptoms is normal, and having a pulse oximeter to check your oxygen can turn a vague worry into an answerable question. Most people recover in one to two weeks, and knowing that the odds are overwhelmingly in your favor is itself useful information to hold onto when you are on day four and feeling awful.