What does a swollen tongue that is blue-purple and dark indicate?

A swollen tongue that is blue-purple and dark typically indicates a condition related to blood stasis, which is often a result of poor circulation or a lack of blood flow. This type of tongue presentation suggests that there may be stagnant blood or accumulation of fluids, leading to both swelling and a change in coloration.

In traditional Chinese medicine, various tongue colors can indicate different underlying conditions; for instance, a blue-purple tongue is often associated with blood-related issues and could signify a lack of proper oxygenation in the tissues. Furthermore, the combination of swelling and such coloration can reflect underlying conditions that may require attention to promote circulation and proper flow of Qi and blood.

While the choice provided indicates toxicosis, the signs of a blue-purple, swollen tongue align more closely with the implications of blood stasis, highlighting the importance of understanding tongue diagnosis in conjunction with other clinical signs and symptoms.