loss of smell is anosmia. Anosmia Causes Nasal congestion from a cold, allergy, sinus infection, or poor air quality is the most common cause of anosmia. Other anosmia causes include: Nasal polyps -- small noncancerous growths in the nose and sinuses that block the nasal passage. Injury to the nose and smell nerves from surgery or head trauma. Exposure to toxic chemicals, such as pesticides or solvents. Certain medications, including antibiotics, antidepressants, anti-inflammatory medication, heart medications, and others. Cocaine abuse. Old age. Like vision and hearing, your sense of smell can become weaker as you age. In fact, one s sense of smell is most keen between the ages of 30 and 60 and begins to decline after age 60. Certain medical conditions, such as Alzheimer s disease, Parkinson s disease, multiple sclerosis, nutritional deficiencies, congenital conditions, and hormonal disturbances. Radiation treatment of head and neck cancers. Anosmia Treatments If nasal congestion from a cold or allergy is the cause of anosmia, treatment is usually not needed, and the problem will get better on its own. Short-term use of over-the-counter decongestants may open up your nasal passages so that you can breathe easier. However, if the congestion gets worse or does not go away after a few days, see your doctor. You may have an infection and need antibiotics, or another medical condition may be to blame. If a polyp or growth is present, surgery may be needed to remove the obstruction and regain your sense of smell. If you suspect a medication is affecting your sense of smell, talk to your doctor and see if there are other treatment options available that won t affect your ability to smell. However, never stop taking a medication without first talking with your doctor. Sometimes a person will regain his or her sense of smell spontaneously. Unfortunately, anosmia is not always treatable, especially if age is the cause. But there are steps you can take to make living with the inability to smell more pleasant and safer. For example, put fire detectors and smoke alarms in your home and office and take extra care with leftovers. If you have any doubt about a food s safety, don t eat it. If you smoke, quit. Smoking can dull your senses, including your sense of smell. I hope you happy with information kindly rate it. thank you .