Exploring the "Forbidden Days" from ancient beliefs: which are true, which are warnings, and what activities are prohibited on specific days?
An old saying goes, "When in Rome, do as the Romans do," but living in Thai society requires even more awareness of "forbidden days"—ancient beliefs passed down for centuries. Whether it's about cutting or washing hair or performing auspicious ceremonies, there are warnings like "do not do this on that day." So, which days forbid what, and what are the reasons behind these prohibitions?
Thairath Online has compiled a complete guide to these forbidden days all in one place.
In Thai life from past to present, "auspicious timing" is essential and cannot be overlooked. Especially the "forbidden days," which are daily practices ancient people warned their descendants to avoid if possible, for good fortune and peace of mind.
One widely heard belief passed down through generations is "no haircuts on Wednesday," because it is considered an agricultural day symbolizing growth. Cutting or damaging hair then is thought to halt wisdom or luck. Some traditions also forbid washing hair on Wednesday, believing it weakens one's guardian angel.
Thursday is regarded as "Teacher's Day," when sacred beings and ancestors have strong power. Thus, the ancients forbade destructive acts like tooth extraction or dismantling homes, and even forbade criticizing others, believing it would bring misfortune and decline.
The saying "No cremations on Friday, no weddings on Saturday" still holds today. Friday is considered a day of luck and happiness (the day's name sounds like the word for happiness). Therefore, funerals or cremations are avoided on this day to prevent endless grief for family and friends.
Although Saturday is a common holiday suitable for celebrations, Thai astrology marks it as the day of the unlucky planet Saturn, associated with suffering and heavy burdens. Thus, the prohibition "no weddings or housewarmings on Saturday" exists, believing that such events will bring unrest and hardship in life. While this is an old belief still observed by many, nowadays some choose to follow what feels right for them.
Sunday carries the intense energy of the sun. Traditionally, large investments or ventures requiring peace and harmony are discouraged from starting on this day, as it may lead to turmoil or conflicts.
Though many ancient prohibitions may now be seen as customs promoting order, following them for peace of mind and tradition is not harmful. The most important thing is to live mindfully and cautiously every day.