Conditions

What are the symptoms of respiratory syncytial virus (rsv) care?

Reviewed by Bellaire ER Medical Team, Board-Certified Emergency PhysiciansUpdated July 4, 2026

RSV usually starts like a cold: runny or congested nose, cough, low-grade fever, and sometimes wheezing. In infants and young children it can progress to fast or labored breathing, poor feeding, and low energy — the signs that the smaller airways are affected.

How RSV Usually Starts

RSV almost always begins exactly like a common cold, which is why it is easy to underestimate. Symptoms tend to appear in stages over several days rather than all at once:

  • Runny or congested nose — often the very first sign.
  • Cough — usually dry at first, and it may become more forceful as the days go on.
  • Low-grade fever — common, though some people run little or no fever.
  • Sneezing and general fussiness or fatigue.

In healthy older children and adults, this is often as far as it goes, and the illness fades over one to two weeks.

Symptoms That Mean the Lower Airways Are Involved

RSV is different from an ordinary cold because it can move down into the small airways of the lungs (bronchiolitis). When that happens, the symptom picture shifts toward breathing:

  • Wheezing — a high-pitched whistling sound with breathing, signaling the small airways are irritated and narrowed.
  • Fast or labored breathing — breathing quicker than normal or clearly working hard, most common in infants and young children.
  • Poor feeding or low energy in babies — taking fewer bottles or breastfeeds, or being unusually sleepy or fussy. In an infant, a change in feeding and alertness is one of the most telling signs.

The Symptoms That Are Dangerous

Certain symptoms mean the body is struggling to get enough oxygen and need emergency evaluation:

  • Retractions — skin pulling in around the ribs, collarbone, or below the breastbone with each breath.
  • Flaring nostrils or head bobbing while breathing, in infants.
  • Grunting or gasping with each breath.
  • Bluish or gray lips, tongue, face, or fingernails.
  • Pauses in breathing (apnea) — an emergency, especially in babies under 6 months.
  • Signs of dehydration — no wet diaper for 8 hours or more, no tears when crying, a dry mouth, or a sunken soft spot on a baby’s head.

Infants under 6 months, premature babies, and older adults with heart disease, lung disease, or a weakened immune system can develop these dangerous symptoms faster, so their milder symptoms deserve closer watching.

For a complete guide, see our RSV page. Bellaire ER is open 24/7 at 5302 Bellaire Blvd with on-site rapid RSV testing — walk in any time or call (713) 660-0001.

Not sure if it’s an emergency? Bellaire ER is open 24/7 with board-certified physicians — walk in or call anytime, or start a telemedicine visit.