Wonder if someone can tell me if this is normal/what it means. Normally I can tell that my asthma's getting worse because of my symptoms which usually come with a fall in peak flow. I rely more on my symptoms rather than numbers as for me this seems more accurate/safe. I don't have an asthma action plan yet as I've only in the last month got my meds really well sorted and got back up to a good everyday peak flow.
However, I measure my peak flow every morning and evening and I've noticed it's been dropping a tiny bit over the last few days and today it dropped down by 60 from yesterday morning. It's still at an OK level and if it got worse I would get help (I have a GP appointment tomorrow anyway so can ask), but the odd thing is that although my peak flow has dropped, I don't have any of my asthma symptoms (unless I exercise) and feel that it's currently well controlled.
Is this normal? Can you get a drop in peak flow without other symptoms? What causes it?