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Yes, it is always a good idea to exercise, as this will help you maintain overall good health.
Of course, certain activities will be more challenging for a person with TN.
Any contact sports such as boxing and the like are to be avoided, obviously.
Depending on a person's abilities, gentle exercise such as walking, swimming, bike riding (get an exercise bike so you can exercise indoors!), stretching or yoga is recommended.
Meditation and self-hypnosis can also help a person cope with ongoing pain issues.