Little-know heart attack symptom when lying down as NHS warn 'call 999'
![Little-know heart attack symptom when lying down as NHS warn 'call 999'](https://i2-prod.mirror.co.uk/incoming/article33137762.ece/ALTERNATES/s615/0_GettyImages-1340061316.jpg)
The NHS is advising individuals to call 999 immediately without delay, as it may indicate a serious condition.
The NHS is advising individuals to call 999 immediately without delay, as it may indicate a serious condition.