Pain in the buttocks after injection is usually due to the stimulation of local muscles by needles or drugs after the intramuscular injection of the buttocks, which leads to inflammation of the buttocks muscles, resulting in swelling and pain in the buttocks. In this case, hot compresses can be applied to the buttocks to promote local blood circulation and reduce swelling and pain. Generally, with the passage of time, the hip pain symptoms will be significantly reduced in about 2-3 days until they gradually disappear. If there is severe pain in the buttocks with obvious symptoms of redness, swelling, heat and pain, you need to go to the hospital promptly and give active anti-infection symptomatic treatment.