What human diseases dogs can recognize

Dogs "sense" changes in human health. How does this happen?

It turns out that diseases provoke chemical changes in the body, which create unique odors. And it is the dog's keen sense of smell that catches them.
Just imagine, dogs have up to 250 million olfactory receptors, while humans have 50 times fewer.
So what changes in the human body can dogs sniff out?

1. Narcolepsy 
   This is a rare brain disease, the main symptom of which is a sleep disorder. People with this disease can suddenly fall asleep at inappropriate times. Once, specially trained dogs detected 11 out of 12 patients with narcolepsy.
2. Cancer.
   This disease is the most famous among those detected by dogs. Cancer cells have a unique odor. That's why there are many stories when a pet dog obsessively sniffed this or that part of the owner's body, and then it was diagnosed with cancer.
3. Migraine
   Some dogs have the talent to notice the first signs of a migraine. They warn their owners by licking them, circling around, looking at them, or barking. This behavior helps people prevent an attack of sharp pain.
4. Changes in blood sugar levels
   This ability can save lives. That's why dogs are trained to recognize isoprene, a naturally occurring chemical that increases significantly when blood sugar levels change. A trained dog can warn the owner of the danger.
5. Severe stress
   Dogs can sense when people are afraid or stressed. They can smell a surge of hormones, increased sweating, and the release of adrenaline and cortisol. At such moments, the dog itself behaves restlessly. In this way, it warns the owners about changes in their emotional state, helping to prevent panic attacks and other post-traumatic stress disorders.

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