why does the wedding ring go on the left hand

The wedding ring is traditionally worn on the fourth finger of the left hand because of an ancient belief from Roman times that this finger contained a vein, called the "vena amoris" or "vein of love," which was thought to run directly to the heart. This belief symbolically connected the ring to the heart and represented eternal love and commitment. Although modern science has shown such a vein does not exist, the tradition has persisted over the centuries as a meaningful symbol of love and unity. The circular shape of the ring itself is also significant, symbolizing eternity and unconditional love. This tradition is most common in many Western cultures, including the UK, USA, and other countries, though in some cultures, such as Russia, Germany, and India, wedding rings may be worn on the right hand instead. The choice of hand and finger ultimately carries symbolic meaning related to love, heart connection, and cultural customs.