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How do you feel after first B12 injection?

Swelling and Skin Reactions A possible reaction to a cyanocobalamin injection is swelling. The swelling may occur in the arms, legs, hands, ankles and feet. Some people may also feel like their entire body is swollen, according to MedlinePlus. Rapid weight gain may also occur.

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Vitamin B12, or cyanocobalamin, is a nutrient the body needs for important functions such as making DNA in cells and forming red blood cells. Animal products, such as meat, milk and eggs contain vital vitamin B12. Most individuals get enough vitamin B12 with a balanced diet. People who do not absorb vitamin B12 correctly through the gastrointestinal tract may require supplement injections. Although vitamin B12 injections are generally safe, some adverse reactions may occur. Always consult a medical professional if adverse reactions occur after receiving medications.

Swelling and Skin Reactions

A possible reaction to a cyanocobalamin injection is swelling. The swelling may occur in the arms, legs, hands, ankles and feet. Some people may also feel like their entire body is swollen, according to MedlinePlus. Rapid weight gain may also occur. Skin reactions that may occur following a vitamin B12 shot include flushing of the skin, especially the face, hives, rash and itching.

Gastrointestinal Reactions

Some people may experience reactions in the gastrointestinal tract after getting a vitamin B12 shot. Some side effects associated with the injections include nausea, vomiting, indigestion and mild diarrhea, according to Drugs.com.

Nervous System Reactions

After getting a vitamin B12 injection some people may experience a disturbance to the nervous system. These symptoms may include dizziness, difficulty walking normally, nervousness, anxiety, weakness and uncoordinated movements. Additional side effects that may occur with injectable B12 include a headache and feelings of pins and needles, according to Drugs.com. Generalized pain, including arthritis, back pain and muscle pain may occur after a vitamin B12 injection. Infections may also occur. An abnormal increase in red blood cells, a runny nose, chest pain, a swollen tongue and fever are additional adverse reactions that may occur after the injection. An unusual warmth, pain or redness in the arm or leg is a serious potential side effect. These symptoms indicate a potential blood clot and require medical attention.

Allergic Reactions

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