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If your medical condition requires it, you are allowed to travel with a juice box or other liquid over 3.4 ounces but be prepared for the liquid to receive additional screening
In fact, sometimes the only symptoms of irritated nerves in the neck occur in the arm muscles, as either tightness, throbbing, or both

10.1111/bjh.12959 18 Estourgie-van BurkG

Those are not interchangeable

Treatment frequency depends on your condition

References (1) Thakkar K1, Billa G2