How do i get the taste of metal out of my mouth after a run ?...
How long and fast do you run? It can be a sign, you overdid it.
The reason (if you're healthy in general...but you also should get a check-up) is, that when you're running very fast, your body has a lot of blood circulating and requires a lot of oxagen for the metabolism. Therefore our breathing and our heart is faster to supply the muscles with sufficient nutrients (ATP, creatine, glucose, fat, protein). Our bronchus / lung is filled with high exposure to blood and mucous in the bronchi, it can happen that individual blood cells mix with the slime and get over the small hairs of the lungs to our mouth. Therefore, we have the metal (to be exact: Iron taste) in the mouth.