Sinus drainage from a typical cold or viral infection lasts 7 to 10 days for most people, though some experience lingering symptoms for up to four weeks. How long yours sticks around depends on what’s causing it: a virus, a bacterial infection, allergies, or an underlying chronic condition. Each has a distinct timeline and different signals that things are improving or getting worse.
Viral Sinus Infections: 7 to 10 Days
The most common cause of sinus drainage is a viral upper respiratory infection, essentially a cold that inflames your sinuses. In a straightforward case, your body clears the infection within a week to 10 days without any medication. The drainage usually starts thin and watery, thickens and turns white or slightly yellow as your immune system ramps up, then gradually tapers off.
During this window, your sinuses are doing exactly what they’re designed to do. Tiny hair-like structures lining your nasal passages beat in synchronized waves, pushing mucus outward at roughly 8 millimeters per minute. When those passages are inflamed and swollen, the clearance system slows down, mucus pools, and you feel that persistent drip down the back of your throat or constant need to blow your nose. As the inflammation subsides, the system speeds back up and drainage resolves on its own.
When It Might Be Bacterial
A bacterial sinus infection produces drainage that lasts longer and often feels more intense. Three patterns suggest your infection has shifted from viral to bacterial:
- No improvement after 10 days. If your drainage, congestion, and facial pressure haven’t budged at all after 10 days from when symptoms started, bacteria are the likely culprit.
- Severe early symptoms. A fever of 102°F or higher combined with thick, discolored nasal discharge and facial pain lasting 3 to 4 days straight points toward a bacterial cause, even early on.
- The “double worsening” pattern. You start feeling better around days 4 to 7, then symptoms come roaring back. This rebound is a hallmark of bacterial sinusitis developing on top of the original viral infection.
With antibiotics, most people notice improvement within 2 to 3 days of starting treatment. Without antibiotics, bacterial sinusitis can drag on for weeks. The total illness, including the initial viral phase, typically falls under the four-week mark for what’s classified as an acute sinus infection.
Allergy-Related Drainage
If your sinus drainage isn’t tied to a cold, allergies are the next most likely explanation. The key difference is that allergy-driven drainage has no built-in expiration date. It persists as long as you’re exposed to the trigger, whether that’s pollen in spring, dust mites year-round, or pet dander in your home.
Allergic drainage tends to be thinner and clearer than what you see with infections, and it’s usually accompanied by sneezing, itchy eyes, or an itchy throat rather than facial pain or fever. Once you remove the allergen or start managing it effectively, drainage typically clears within a couple of weeks. If it doesn’t resolve in that timeframe, something else may be going on.
Chronic Sinusitis: 12 Weeks or More
When sinus drainage, nasal congestion, facial pressure, or a reduced sense of smell persist for 12 consecutive weeks or longer, the condition is classified as chronic rhinosinusitis. This isn’t just a cold that won’t quit. It represents ongoing inflammation in the sinuses that your body can’t resolve on its own, sometimes driven by structural issues like nasal polyps, a deviated septum, or an immune system that overreacts to environmental irritants.
Chronic sinusitis affects a significant number of adults, and its drainage pattern looks different from an acute infection. Rather than a surge of mucus that peaks and fades, you experience a low-grade but relentless drip that may fluctuate in intensity without ever fully stopping. Treatment usually involves nasal corticosteroid sprays, saline rinses, and sometimes longer courses of medication or surgical intervention to open blocked passages.
How Treatments Affect the Timeline
Several over-the-counter and prescription options can shorten the period you’re dealing with active drainage, but their timelines vary.
Nasal corticosteroid sprays (the ones you can buy at most pharmacies) reduce the inflammation that drives excess mucus production. They start working within 7 to 8 hours for most people, though some notice relief in as little as 2 to 4 hours. These sprays are most effective when used consistently over several days rather than as a one-time fix.
Saline rinses and sprays work mechanically, physically flushing mucus out of your nasal passages and helping thin what remains. They won’t cure anything, but they reduce the volume of drainage you’re dealing with while your body heals.
Decongestant nasal sprays provide fast relief by shrinking swollen tissue, but they come with a hard limit: three days of use, maximum. Beyond that, they trigger a rebound effect called rhinitis medicamentosa, where the spray itself causes your nasal lining to swell more than it did before you started using it. This creates a cycle of worsening congestion and drainage that can take weeks to break.
Sinus Drainage in Children
Kids follow a similar timeline to adults for viral sinus infections, with drainage typically lasting 7 to 10 days. The difference is that children get more colds per year than adults do, so parents may feel like the drainage never fully stops between infections. If a child has thick, discolored drainage persisting beyond 10 days, that’s generally the point where antibiotics are considered, just as in adults. Fever accompanying prolonged drainage is a stronger signal in children that the infection has become bacterial.
Signs Your Drainage Needs Attention
Most sinus drainage resolves without intervention, but certain patterns signal that something more serious is happening. Symptoms that last beyond a week without any improvement, or that seem to get better and then worsen again, warrant a visit to your doctor. A persistent fever alongside drainage is another signal.
A few symptoms require immediate attention: pain, swelling, or redness around the eyes, high fever, confusion, or any changes to your vision. These can indicate that a sinus infection has spread beyond the sinuses, which is rare but serious. The sinuses sit close to the eyes and brain, and infections that breach those boundaries need rapid treatment.