It may be caused by cold weather in poor elasticity of blood vessels and vascular spasm. See paragraph "Heart Attack Symptoms". Immediate hospitalization is crucial. The blockage of a blood vessel of the heart leads to atrophy and subsequent myocardial necrosis if a stand is not put or a more complex heart surgery is not performed within 3 to 6 hours.
A book about the 50 most common diseases, how to treat them and how to avoid generally being sick.