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Skip to main content. Your sense of smell helps you enjoy life. You may delight in the aromas of your favorite foods or the fragrance of flowers.

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Your sense of smell is also a warning system, alerting you to danger signals such as a gas leak, spoiled food, or a fire. Any loss in your sense of smell can have a negative effect on your quality of life. It can also be a sign of more serious health problems. One to two percent of North Americans report problems with their sense of smell. Problems with the sense of smell increase Diskrders people get older, and they are more common in men than women.

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In one study, nearly one-quarter of men ages 60—69 had a smell disorder, while about 11 percent of women in that age range reported a problem. Many people who have smell disorders also notice problems with their sense of taste.

Your sense of smell —like your sense of taste—is part of your chemosensory system, or the chemical senses. Your ability to smell comes from specialized sensory cells, called olfactory sensory neurons, which are found Dksorder a small patch of tissue high inside the nose. These cells connect directly to the brain.

Each olfactory neuron has one odor receptor. Once the neurons detect the molecules, they send messages to your brain, which identifies the smell. There are more smells in the environment than there are receptors, and any given molecule may stimulate a combination of receptors, creating a unique representation in the brain. These representations are registered by the brain as a particular smell. Smells reach the olfactory sensory neurons through two pathways.

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The first pathway is through your nostrils. The second pathway is through a channel that connects the roof of the throat to the nose. Chewing food releases aromas that access the olfactory sensory neurons through the second channel.]