Why do I randomly smell a chemical smell?

Author: Davion Hoeger  |  Last update: Saturday, July 4, 2026

Phantosmia may be caused by a head injury or upper respiratory infection. It also can be caused by aging, trauma, temporal lobe seizures, inflamed sinuses, brain tumors, certain medicines and Parkinson's disease. Phantosmia also can result from a COVID-19 infection.

What does it mean if you smell a chemical smell?

Phantosmia is a condition that causes you to detect smells that aren't actually in your environment. It can happen in one nostril or both — and the odors may be foul or pleasant. Common causes include colds, allergies, nasal polyps and dental issues. Treatment depends on the underlying cause.

Why do I have a weird chemical smell in my nose?

Many different health condition can cause a bad smell to come from the nose. These can include sinus infections, dental problems, dry mouth, smoking, and digestive issues. Certain foods, beverages, and drugs can also result in odors coming from the nose.

Why do I smell a weird smell that isn't there?

Smelling things that aren't there is called phantosmia. It can be unpleasant and affect how things taste. But it isn't usually serious and may go away by itself in a few weeks or months. See your GP if the strange smell doesn't go away in a few weeks.

When should I be concerned about phantom smells?

If you notice phantom smells, talk to your doctor about it. They may do a thorough physical exam and ask about your medical history to make sure you don't have another underlying cause, like a brain tumor. Doctors may also have to rule out another similar smell disorder called parosmia.

Nurse Alice on KTLA: Phantom Smells

Why do I smell metallic?

Your body naturally contains trace amounts of metals like iron, copper, and zinc. When these metals mix with sweat, they can produce a metallic odor. Hormonal changes, certain medications, or even your diet can affect the levels of these metals, leading to a stronger smell.

Why does my body odor smell chemical?

If you have diabetes, a change in body odor could be a sign of diabetes-related ketoacidosis. High ketone levels cause your blood to become acidic and your body odor to be fruity. In the case of liver or kidney disease, your odor may give off a bleach-like smell due to toxin buildup in your body.

What STD causes ammonia smell?

A vagina that smells like ammonia is rarely a sign of a STI. However, some STIs are known to cause intense or foul-smelling urine, especially chlamydia. It is essential to get tested for STIs, as infections such as chlamydia often occur without symptoms.

What does BV smell like?

BV is responsible for the fishy smell most commonly associated with unpleasant vaginal odors. The fishy smell may be especially strong after sex. Another common symptom to look out for with BV is a gray or grayish-white discharge.

What are the symptoms of smelling chemicals?

Some chemicals with strong odors may cause eye, nose, throat or lung irritation. Strong odors may cause some people to feel a burning sensation that leads to coughing, wheezing or other breathing problems. People who smell strong odors may get headaches or feel dizzy or nauseous.

Why do I keep smelling ammonia?

Conditions like kidney disease, diabetes or hyperhidrosis can affect how your body processes waste, leading to an intense ammonia smell. It's essential to tune into your body's signals and consult with a healthcare professional if you suspect your sweat's scent is more than just a dietary or exercise-related quirk.

Why do I keep smelling bleach in my nose?

1) You may have some tooth or gum inflammation or infection. 2) Your nose may be picking up residual odors from garments or materials washed with bleach. If it's in your clothing others may not necessarily smell it. 3) Many unusual odors may be associated with sinus infections.

What is a chemical smell out of nowhere?

Phantosmia may be caused by a head injury or upper respiratory infection. It also can be caused by aging, trauma, temporal lobe seizures, inflamed sinuses, brain tumors, certain medicines and Parkinson's disease. Phantosmia also can result from a COVID-19 infection.

What is a brain tumor phantosmia?

Smelling smoke, or experiencing phantom smells that are not actually present, can be a symptom associated with certain types of brain tumors. These olfactory hallucinations, known as phantosmia, can occur when a tumor affects the brain regions responsible for processing smell signals.

When I sniff it smells like chemicals?

Phantosmia is when a person smells something that is not actually there. The smells vary between individuals but are usually unpleasant, such as burnt toast, metallic, or chemical smells. Possible causes range from nasal polyps to a stroke. Phantosmia is also called a phantom smell or an olfactory hallucination.

What are STD smells?

Strong fishy or onion-like smells point to the possibility of an infection or STI. Two main STIs can cause onion-like vaginal odor along with a handful of other conditions. Most causes of unhealthy vaginal odors can be treated and will return to normal within a few weeks.

What are 5 symptoms of trichomoniasis?

Women with trich may notice:
  • Itching, burning, redness or soreness of the genitals.
  • Discomfort when peeing.
  • A clear, white, yellowish, or greenish vaginal discharge (i.e., thin discharge or increased volume) with a fishy smell.

What disease causes ammonia smell?

Kidney disease causes chemicals in urine to become concentrated and to cause a smell resembling ammonia. Kidney dysfunction can also cause high urine bacteria and protein levels, contributing to an ammonia smell.

Why do I have a strong chemical smell down there?

Chemical smell

A chemical, bleach-like smell may be caused by a build-up of urine in your underwear or around your vulva. Urine contains a byproduct of ammonia called urea. When you're dehydrated, urea is not as diluted as it should be which could be causing a chemical smell.

What does thyroid sweat smell like?

While thyroid disorders don't directly cause sour-smelling sweat at night, a change in thyroid hormone production can impact the rate of sweating. In turn, more sweat can result in body odor.

What is the weird chemical smell from the body?

Trimethylaminuria is a disorder in which the body is unable to break down trimethylamine, a chemical compound that has a pungent odor. Trimethylamine has been described as smelling like rotten or decaying fish.

What autoimmune disease causes body odor?

Trimethylaminuria (TMAU) is a rare disorder in which the body is not able to metabolize the chemical trimethylamine, and this causes body odor.

Can you smell sickness in yourself?

Some people have such an advanced sense of smell that it helps them detect and diagnose diseases, both in themselves and in others. The reason we can smell infection, tell when someone is sick from their body odor, or sense “sick breath” is because many diseases alter the chemical composition of our body fluids.

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