THUMB, emotional and spiritual meaning

Thumb: It is this finger the one that allows us to make things right and grab them tightly.

Problems in the thumb can express the feeling that we have lost control of events, or the pain we feel for being unable to act or take control of a situation.

The thumb on the other hand, is also a symbol of power, protection or conviction. In gladiatorial combat, the fate of these depended on the thumb of the person presiding combat. 
Also in the Roman circus, a thumb down meant leaving the man before the wild beast without protection or defence.

Nowadays we usually use the thumb to express a value judgment, when we want to show a satisfaction to something we lift the thumb, or down when we want to show our disapproval.

The thumb represents our will and our responsibility.

When we suffer some damage on this finger it may mean that we are concerned about something, whether related to our mother, or even something we said because we feel that someone forces us to do something we do not want.

Similarly, it may indicate that we are weak and need protection against what we consider external aggression and also we feel defeated and plunged into sadness.

The thumb also represents the mother, is related to the "emotional nutrition" of babies that tend to insert it into their mouths and suck when the emotional nourishment from his/her mother is missing. 
It is related to the sense of taste.

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Image:thaoefracture.com