As per vedic astrology, the black colour of the thread signifies Shani (the planet). Thus, wearing the black thread around your ankle makes Lord Shani your guide and protector for life.
To everyone’s surprise, wearing a black thread anklet fastens the healing process in cases of any injury.
Stomachaches due to naval dislocation are a common belief in India and are a nightmare to bear with. Wearing a black thread puts the naval back in its place and reduces the pain.