The way the #immunesystem works is it tries to keep the balance between all the cells in the body. It wants to protect it! It wants to keep it safe.
And when it detects harmful cells it signals our brain which reacts by sending "soldier" cells to fight the harmful ones.
This system is a #perfect invention by our mother-nature.
Until it crashes. Until it fails. Until you need medication in order to treat the default.
That is when the immune system perceives useful cells as harmful.
And all the allergic and symptomatic reactions kick in.
I studied this topic until I found a solution because my life was limited due to my allergies.