The most common reason for this in men tends to be a need for a simple dose adjustment. There's a general 8 week uptake period where injected levels increase week over week & then natural production tends to slow down/stop. Around the week 3-5 marks, two things can happen. The first is that the injected Testosterone & the natural Testosterone together hit a mark that your body sees as ideal, then the natural continues to fall off. In that case a simple increase of 10-20mg tends to return you to that point & we consider that very normal & part of dialing you in. The second can be that you experience the above, but that it's too much Testosterone together & so you transition additional Testosterone into Estrogen during this time. If it's just that, then this should go away when the natural production slows & it is important to not over react during this time and increase an AI, when it may be overkill later. If it doesn't improve by weeks 7-8 & you have consistent high Estrogen symptoms then adding or increasing an AI slightly or lowering your Testosterone dose slightly tends to fix things. Somewhere between 20-30% of men need some kind of adjustment around the 7-8 week mark for those reasons.