 [ Symptoms ] is it better to apply cold or hot to a injection site for pain relief  received a pneumovax 23 injection in the muscle of my upper arm pain and stiffness at the injection site for pain relief i took 1 aleve so far no relief would it be helpful for pain relief to apply a hot or cold compress to the site of the injection i can barely move my arm  thank you [ Disease ] hi if you bottle feed your baby or combine bottle feeding with breastfeeding your first period could start as soon as 5 6 weeks after you give birth if you fully breastfeed and do not combine bottle feeding with breastfeeding it is possible that your periods may not start again until you stop breastfeeding this is your body is way of preventing additional pregnancies while you have a small baby do hope this helps good luck