Sounds like your estrogen is tanked.
Hes not takiing anything that lowers estrogen, its more likely his estrogen is high. Nolve and enclo block estrogen recptors but they do very little to actually lower estrogen.
OP
This all looks like classic "im on steroids so steroids did this", if one of my friends or clients came to me im this situation the gear and pct and all that would be bottom of my list of concerns. Id be going to the dr. To get my knees looked it. Waiting for bloodwork Does it even make any sense.
If i was you i would be thinking
Your 41, your using steroids which allow you to move more weight for more sets and reps but its only your muscles getting that benifit, id bet my left nutt its a wear and tear injuries compiled over your life "not from the eliptical" but this is most likely a combination of overuse injuries from age and the gym.
My knees blew up last month on cycle, it wasnt from steroids. It wasnt from estrogen, its from getting older and beating myself up 10hrs a week training
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My knees, lower back and shoulders flare up a few times a year, were getting old. I dont even see how you could possibly link yiur hormones to this, and if its not estrogen related or it wouldnt just be your knees, it would be all your joints in your body. Low estrogen isint going to Magically attack your knees and leave your ankles, elbows and wrists alone. Every joint would hurt.
Go to the walk in or make a dr. Appointment. Maybe you tore the miniscus in your knees, if so the pain gets worse as you break parallel. Could also 7000 other things