The effects of progesterone injection on pregnant women include dizziness, breast swelling and pain, digestive discomfort, skin damage, etc. However, the risk of long-term large amount of injections is higher, and a single injection usually does not have a great effect. Progesterone injection is commonly used as a birth control drug, commonly used in the treatment of preeclampsia, as well as habitual abortion caused by luteal insufficiency, etc. However, progesterone injection has its corresponding side effects. After injection, some patients have dizziness, headache or even fainting, and may experience breast distension, abdominal distension, diarrhea, nausea and vomiting. Allergic people may develop allergy, itching, redness, swelling, hives on the skin, etc. Sometimes hard nodules can be formed at the injection site, which may even lead to the formation of localized sterile abscesses. Progesterone injections should be used according to the doctor’s instructions after the doctor has evaluated the condition.