My RHR usually ranges from 59-67. However over the past six weeks it has been mid 70s, sometimes 80. I did have a cough when the increase first started. Have noticed increases like this in the past when I've had a cold or flu but they've only lasted a few days. Anyone had this happen for so long? I feel fine. Wondering am I anaemic. Am breastfeeding 7 month old so maybe poor sleep could could be causing it too? Though my RHR was normal despite feeding throughout the night for months prior to this.