RSV in adults typically causes mild, cold-like symptoms: runny nose, congestion, coughing, sore throat, sneezing, low-grade fever, and general fatigue. Symptoms usually appear four to six days after exposure and resolve within one to two weeks. For most healthy adults, RSV feels indistinguishable from a common cold. But for older adults and those with certain chronic conditions, the virus can move into the lungs and become serious.
What RSV Feels Like in Most Adults
The majority of adults with RSV never realize they have it. The early symptoms are the same ones you’d expect from any upper respiratory virus: a stuffy or runny nose, mild cough, sore throat, and low-grade fever. You might also notice a decrease in appetite, which is more characteristic of RSV than of the flu or COVID-19. Some people feel generally run down for several days before symptoms peak.
The cough tends to be the most persistent symptom. While congestion and sore throat typically improve within five to seven days, a dry or mildly productive cough can linger for two weeks or occasionally longer. Some adults experience repeated episodes of wheezing even after other symptoms have cleared.
Signs the Infection Has Moved to Your Lungs
RSV becomes a concern when it spreads from the upper airways (nose and throat) into the lower respiratory tract. This can cause bronchitis or pneumonia. The shift usually happens several days into the illness, and the warning signs are distinct from typical cold symptoms.
Watch for difficulty breathing, wheezing that you can hear or feel in your chest, chest tightness or pressure, and a noticeable drop in your energy level beyond normal cold fatigue. Trouble eating or drinking, sudden dizziness, confusion, or symptoms that seemed to improve and then worsen again are all signals that the infection is progressing. Any of these warrants a call to your doctor.
Who Faces the Highest Risk
RSV poses the greatest threat to adults 75 and older, people with weakened immune systems, and those living in nursing homes. But age alone isn’t the only factor. Several chronic conditions significantly raise the risk of severe RSV illness:
- Chronic lung disease such as COPD, emphysema, or asthma. RSV can trigger flare-ups that are difficult to distinguish from a typical exacerbation.
- Heart failure or coronary artery disease. RSV can worsen heart failure symptoms because the added respiratory strain increases demand on an already compromised heart.
- Diabetes with complications like kidney disease or neuropathy.
- Severe obesity (BMI of 40 or higher).
- Conditions affecting airway clearance such as post-stroke swallowing difficulties or neuromuscular diseases.
- Chronic liver disease, chronic kidney disease, or chronic blood disorders like sickle cell disease.
If you have asthma or COPD, RSV doesn’t just add new symptoms on top of your baseline. It actively worsens the underlying disease, making it harder to breathe in ways that may persist even after the virus clears. Heart failure patients face a similar problem: the inflammation and fluid shifts caused by the infection can destabilize a condition that was previously well controlled.
How RSV Differs From the Flu and COVID-19
Because RSV, influenza, and COVID-19 share many symptoms, it’s hard to tell them apart based on how you feel. But there are some patterns worth noting.
Headaches are more common with the flu and COVID-19 than with RSV. Loss of taste or smell still points more toward COVID-19. Gastrointestinal symptoms like nausea, vomiting, or diarrhea are more associated with the flu and COVID-19, while RSV more often causes a simple loss of appetite without stomach issues.
Breathing trouble can occur with both RSV and COVID-19, but it tends to feel different. RSV is more likely to produce audible wheezing, caused by inflammation in the small airways of the lungs. COVID-19 is more likely to leave you feeling winded, as though you can’t get a full breath. Both warrant medical attention, but the distinction can help your doctor narrow things down before testing.
How RSV Is Diagnosed
You can’t confirm RSV based on symptoms alone. If your doctor suspects it, particularly during RSV season (fall through early spring), they’ll order one of two types of tests using a nasal swab. PCR-based tests are highly sensitive and are the most reliable option. Rapid antigen tests return results faster but are less accurate, meaning a negative result doesn’t completely rule out RSV. Many clinics now use multiplex panels that test for RSV, flu, and COVID-19 from a single swab.
Testing matters most for people at high risk of complications, since a confirmed diagnosis can guide treatment decisions and help doctors monitor for pneumonia or other worsening signs.
Vaccination for At-Risk Adults
The CDC recommends a single dose of RSV vaccine for all adults 75 and older and for adults ages 50 to 74 who have conditions that put them at increased risk (the same conditions listed above). You don’t need medical records to prove your risk factor; simply telling your pharmacist or provider is sufficient.
For adults under 50, two RSV vaccines have been approved for those at increased risk of severe lower respiratory illness, though broader CDC recommendations for this age group are still under review. If you’re younger than 50 with a chronic lung, heart, or immune condition, it’s worth asking your provider whether vaccination makes sense for you based on your specific situation.