Doctors said that a number of diseases in addition to coronavirus cause loss of smell 
Chief Physician clinic “Your Doctor”, therapist Tatyana Romanenko named Ura.ru a number of diseases that cause loss of smell. According to them, this can happen due to various respiratory diseases, allergies or damage to the nervous system.
According to Chalenko, loss of smell is not only a symptom of coronavirus infection. Other respiratory viruses, such as allergic rhinitis, vasomotor rhinitis, as well as diseases with damage to the central nervous system, such as multiple sclerosis or Alzheimer's syndrome, may contribute to its appearance, the doctor said.
Romanenko, in turn, added that this ailment can provoke any diseases of the nasal cavity, upper respiratory tract, any respiratory viral infection, runny nose, nasal congestion, as well as allergic diseases. The specialist noted that in order to diagnose the patient correctly, he needs to be examined by a doctor.
Earlier, the chief otolaryngologist for the Northwestern Federal District, Sergei Ryazantsev, told how the loss of smell during coronavirus affects the body. This symptom affects all health, the doctor said. He noted that the distortion or loss of smell in COVID-19 causes problems with appetite and digestion. The physician also linked this symptom with a loss of libido.