Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
These symptoms need assessment but are not always emergencies.
Use emergency services for possible heart attack or stroke symptoms, fainting with chest discomfort, sudden severe shortness of breath, or a limb that suddenly becomes painful, pale, cold, numb, or weak.
Do not drive yourself when emergency symptoms are present.
Contact a clinician promptly for new or worsening chest discomfort with activity, a clear reduction in walking distance, foot pain at rest, a wound that is not healing, or medicine side effects.
Routine follow-up is used to review blood pressure, cholesterol, blood sugar, symptoms, physical activity, tobacco use, and how medicines are working.
Blood tests may be repeated after treatment changes or at intervals chosen by the clinician.
People who have had a stent, bypass operation, stroke, heart attack, or limb procedure may need follow-up with one or more specialists.
Every sign above is quoted from the sofidex article on Atherosclerosis. If you are not sure, err upward — it is always reasonable to be checked.