Scientists are exploring a new approach to detecting diseases by analysing the tiny molecules released through human breath, sweat, urine and skin. Recent research suggests that these chemical signals could eventually help identify conditions such as Parkinson’s disease, Alzheimer’s disease and certain cancers.
The approach could make medical testing less invasive and potentially help doctors recognise some illnesses earlier. Researchers are now using advanced sensors and artificial intelligence to study patterns of molecules that may be linked to specific diseases.
How Body Odours Could Reveal Health Problems
The human body releases thousands of chemical compounds through normal biological processes. Some of these compounds, known as volatile organic compounds (VOCs), may change when a person develops an infection or another medical condition.
Scientists are investigating whether these changes can provide useful information about a person’s health.
Researchers collect breath or other biological samples and examine their chemical composition using laboratory equipment. Some teams are also developing electronic noses equipped with sensors that can recognise different molecular patterns.
Parkinson’s Disease Research Shows Promising Results
One particularly interesting area of research involves Parkinson’s disease.
Scientists have identified differences in the oily substance produced by the skin, known as sebum, between people with Parkinson’s and those without the condition.
In research involving these chemical patterns, scientists reported that the approach could correctly identify more than 84% of people with established Parkinson’s disease.
Researchers are also investigating whether these signals could help identify the condition before its symptoms become clearly noticeable.
New Possibilities for Cancer Detection
Body-generated chemical signals are also being studied for cancer detection.
In one investigation, researchers identified a group of six molecules in urine samples that detected prostate cancer in 75% of cases.
Although this approach was less sensitive than the commonly used PSA blood test, it produced fewer false-positive results in the study.
Another developing technology uses AI to examine patterns of molecules in urine to identify possible signs of bladder cancer. Its developers are also exploring similar testing methods for Alzheimer’s disease.
Can Breath Tests Detect Infections?
Scientists are studying whether breath analysis could help distinguish between different infections.
An earlier study involving 235 patients found that certain breath-based biomarkers could distinguish influenza from similar infections with 78% accuracy.
Researchers are also investigating whether these tests could help doctors differentiate bacterial infections from viral illnesses, potentially supporting more appropriate treatment decisions.
More Research Needed Before Routine Medical Use
Despite the promising developments, these technologies are not yet ready to replace established diagnostic tests.
Factors such as pollution, medicines, body position and changes in breathing can affect the chemical composition of samples. Researchers also need more standardised testing methods and larger studies to confirm the accuracy of these technologies.
If further research proves successful, body-based chemical testing could eventually provide doctors with additional tools for detecting diseases earlier and monitoring patients more conveniently.
