When you inject into the arm (deltoid) your main goal will be to penetrate the muscle and then slowly deliver the vitamin B12 into the muscle, and then extract the needle at the same 90 degree angle that you inserted it
Your doctor will usually focus on the following factors: Examining the welts: Noting their size, colour, and how they move around the body Talking through your history: When the hives started, how long they last, and how often they appear Looking for triggers: Recent foods, new medications or supplements, environmental exposures, or stress Further tests arent usually needed unless the hives are persistent, uncomfortable, or come with other worrying signs, such as swelling of the lips, tongue, or throat
Grober JS, Yershov AL, et al
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