What Causes an Ammonia Smell in Your Nose and When to See a Doctor

A recurring ammonia smell in the nose might be from sinus infections, allergies, or medications. If it lingers or worsens, it’s important to get evaluated by a specialist.

Have you ever noticed a strange, sharp scent in your nose that reminds you of cleaning chemicals? If so, you’re not imagining things. This unusual sensation could be an ammonia-like smell in your nose — and while it may seem odd or concerning, you’re not alone. Many people report experiencing this type of smell at some point. It might appear suddenly, fade quickly, or linger for days. Understanding the possible causes of this sensation can help you figure out whether it’s something temporary or a sign of a deeper issue.

One of the most common causes of strange smells in the nose, including ammonia or metallic odors, is a sinus infection. When the sinuses become inflamed and filled with mucus, bacteria can start to grow, producing unpleasant odors. This kind of smell may be described as metallic, sour, or chemical-like. If you’ve had a stuffy nose, sinus pressure, or facial pain recently, a sinus infection might be the reason for the odor.

Another frequent cause is postnasal drip, which occurs when excess mucus from the nasal passages drips down the back of your throat. This can be triggered by allergies, colds, or environmental irritants. The accumulation of mucus can affect both your sense of smell and taste, leading to sensations like a sour or ammonia-type odor in your nose or mouth.

In some cases, the smell could be a side effect of medications. Drugs that affect your metabolism or kidney function, including certain antibiotics or supplements, can alter the way your body processes waste and odors. This might result in a noticeable chemical-like smell, especially when combined with dehydration or illness.

In rarer instances, a persistent ammonia smell in your nose may be a symptom of more serious health issues, such as advanced kidney disease. When the kidneys aren’t functioning properly, waste products like urea can build up in the body and produce unusual odors. This is sometimes referred to as “uremic fetor,” a term for the strong ammonia or urine-like smell that may come from the breath or nasal passages in people with kidney problems.

If the smell persists for more than a few days, or if it comes with additional symptoms like headaches, facial pressure, fever, or fatigue, it’s time to seek medical advice. Your doctor may perform a physical exam, review any medications you’re taking, and possibly order imaging or lab tests to find the cause.

While occasional weird smells in the nose can be harmless and short-lived, persistent or strong odors should never be ignored. Identifying the source of the ammonia-like scent can not only bring peace of mind but also prevent larger health issues from developing. Whether it’s a sinus issue, a reaction to medication, or something more serious, your healthcare provider can help guide you toward the right treatment.