Low estradiol on TRT is one of the most underestimated causes of flat libido, joint pain, anxiety, and poor sleep. It typically results from overuse of aromatase inhibitors like anastrozole, but can also occur in naturally low-aromatizing men on lower doses or transdermals. Symptoms often mirror high E2 (ED, low drive, mood changes), which is why lab testing by a sensitive assay is essential. Threads here cover what crashed E2 feels like, how long recovery takes after dropping anastrozole, whether to dose-pause, and how members rebuild stable estradiol over weeks.