No, it is not true that when a woman cries, a small vein in her heart cuts. This is a common misconception and an old wives' tale that has no scientific basis. Crying is a natural emotional response that can occur in both men and women. When a person cries, they may experience increased heart rate and changes in blood flow, but there is no cutting of veins in the heart as a result of crying.
Crying is a healthy and normal way for humans to release emotions and cope with stress or overwhelming feelings. It can actually have some therapeutic benefits by reducing stress and promoting emotional well-being. If you or someone you know is experiencing intense or prolonged emotional distress, it's important to seek support from friends, family, or a mental health professional.