i run out of breath when im in the cold, and then my back starts hurting, why is that ?
Cold air is a well-known trigger for asthma. You don't say if you already have an asthma diagnosis, but if you do, that's probably the explanation. I'm not sure about the backache though, as pain is not one of the symptoms of asthma. It could be from the strain of trying to catch your breath, though, perhaps.
If you have asthma and cold air is a trigger, then it's important to do what you can to avoid breathing in cold air. Staying inside is the obvious answer, but that's of course not the easiest thing to do, since winter can last for months. Alternatively, the key is to warm the air before you breathe it in. I find that placing a scarf or neck gaither over my mouth helps a lot. Breathing through your nose is good too, if it's possible.
To your health,