NHS Breathlessness Campaign
We all get short of breath sometimes, but if you get out of breath doing everyday things you used to be able to do it could be a sign of lung disease, such as COPD (chronic obstructive pulmonary disease), or heart disease.
It could also be a sign of other health problems such as anaemia or anxiety. But don't try and diagnose yourself, go and see your doctor to find out for sure.
The good news is that the conditions that cause shortness of breath can often be treated. So it's important to see your doctor if your breathing is difficult or uncomfortable, or if it feels like you can't get enough air.
Read more at https://www.nhs.uk/be-clear-on-cancer/symptoms/out-of-breath#YMuI7ZHTRBcbQkWR.99