It is good to get checked but unlikely to be anything serious or else you would have been asked to see the GP for treatment, not the nurse for monitoring and lifestyle.
A few months ago I got an unsolicited text message from my GP surgery telling me that I had been identified as being at high risk of cardiovascular disease and to make a screening appointment.
Whilst I could see the funny side, confident that the cardiac cath lab probably wasn't teeming with 45 year old female non smoking para athletes with a clean diet and old parents, I got home to find my poor husband practically booking his funeral having received the same text message.