I'm a young healthy male but sometimes when I walk up and down the hill to my local shop and back I get a little amoun of shortness of breath. I can go to the gym and I'm perfectly fine and I don't have any chest pain at all or tiredness and that. Recently my anxiety has been absolutely fine but I've just google "shortness of breath" and loads of heart disease stuff (which has scared me) came up which have make me a bit worried. Sometime a get a bit of pressure in my sides but I think that's due to my poor posture. Please can somebody reply to this.