Many diseases can be diagnosed through smelling

From diabetes, bladder infections to liver failure, schizophrenia . can be diagnosed by smelling.

Doctors say the breath of diabetics has the smell of nail polish remover, while the person with liver disease breathes the smell of raw fish.

The study, published in the journal Sensors, also explains that bladder infections make urine smelly of plastic tissue, while rubella causes sweat to spit on new chicken feathers.

Schizophrenia causes sweat to smell vinegar and typhoid, making the skin 'fragrant' with freshly baked bread.

Finally, yellow fever can cause the sick person to smell the smell of a butcher shop - a rash - an infection in the lymph nodes - that causes the patient to smell stale beer.

A patient even claimed that he could 'smell' his own cancer. On a web forum, Joanie said when her husband had prostate cancer, and when she had lung cancer, she could smell the 'rotten' odor, which disappeared when the cancer was treated.

The breath of diabetic people has the smell of nail polish remover

Dr. George Preti, at the Monell Center for Chemical Sensors in Philadelphia, USA, said he had heard many patients that they found an unpleasant smell around someone with cancer. He hopes this finding could lead to new ways to diagnose cancer earlier, especially with ovarian cancer, which is usually diagnosed when it's too late.

According to Dr. Preti, our bodies secrete a lot of chemicals as a result of normal metabolism, but cancer cells have a very different metabolism, meaning they produce other chemicals and emitted a distinct smell.

These smells are often too 'discreet' to the human nose, but trained dogs can 'smell' the disease with an accuracy of up to 90%.

However, dogs are not the only organism capable of detecting cancer, scientists believe that fruit flies also have this ability. The research team at Konstanz University, Germany, found that the smell of cancer cells could cause a centralized pattern of activity in the fruit fly's antenna. They hope to develop the 'antenna' for humans to detect disease.

Another device coming to market is the 'electronic nose' called BreathLink. Testing has shown that it can detect breast cancer through the patient's breath. Results are within 10 minutes and help patients not have X-rays.

At the same time, another company called Owlstone is hoping to market a device that can smell bowel cancer.

Just a few weeks ago, researchers at the Karolinska Institute, Sweden, discovered that we can smell people whose immune systems are working hard. This smell appears only a few hours after exposure to the bacteria.