Trigeminal neuralgia, if very severe, can also cause facial swelling. This is because the muscle tissue in the human body has a neurotrophic function, meaning that its nerves do not only play a controlling role but also have a nutritive function. If the pain from the trigeminal neuralgia is continuously severe, this can lead to the loss of the nutritive function, and over time it might cause muscle edema. Therefore, in such cases, it is crucial to promptly determine any changes in the condition and proceed with the necessary examinations and treatments early on to reduce problems of facial swelling caused by severe trigeminal neuralgia pain later. This often appears in the later stages and indicates that the condition has become relatively severe, requiring timely treatment.