What did @mathildahogbergs actually say?
In a 256K-view TikTok, @mathildahogbergs described three things that surprised her after starting estrogen-based HRT as a trans woman. She said her emotional range intensified, that she lost significant muscle strength (dropping from 30-40 push-ups to zero), and that the process was physically painful, comparing it to "a second puberty" with soreness throughout her body. These are personal experience claims, not medical advice, and she frames them that way. That matters for how we evaluate them.
The claims are experiential and anecdotal, but they track closely with documented physiological and psychological effects of feminizing hormone therapy. That doesn't make them universal, but it does make them worth taking seriously rather than dismissing as TikTok noise.
Does the science back this up?
Mostly yes, with some important nuance. All three claims she makes have biological plausibility and varying degrees of clinical support, though the emotional changes are the most debated in the literature.
On muscle loss: this is well-documented. Testosterone is the primary driver of skeletal muscle protein synthesis, and removing it while adding estrogen reduces lean mass and muscle strength significantly. A 2021 study by Roberts et al. in the British Journal of Sports Medicine found that trans women showed meaningful declines in muscle strength and lean body mass after 2 years of feminizing HRT, though some advantages over cisgender women persisted. Her experience of going from 30-40 push-ups to zero sounds extreme, but early HRT transitions can involve rapid hormonal shifts that hit muscle function hard before the body stabilizes.
On emotional intensity: Karalexi et al. (2020, Psychoneuroendocrinology) found that estrogen influences amygdala reactivity and emotional processing. Trans women on estrogen report heightened emotional sensitivity. However, the directionality here is complex. Some of this may also reflect psychological factors tied to transition itself, not purely hormonal.
On pain during feminizing HRT: breast tissue development (thelarche) is known to cause soreness. Joint and body aches during hormonal transitions are also reported, though less systematically studied in trans populations specifically.
What did they get wrong (or right)?
She got the broad strokes right. The framing is honest and the experiences are consistent with what the science describes. But a few things deserve scrutiny.
The muscle loss claim is accurate in direction but potentially overstated in speed. Going from 30-40 push-ups to zero in a short window is a dramatic drop. Some of this could reflect other factors: reduced training, fatigue related to hormonal adjustment, or the psychological weight of transition. Attributing it entirely to estrogen is too clean. Strength declines on feminizing HRT are real but typically gradual over months to years, not sudden collapses.
The emotional claim is the weakest from an evidence standpoint. Saying feelings are "heightened" implies estrogen simply amplifies everything, but the reality is more complicated. Estrogen changes emotional processing, it doesn't just turn up a volume knob. Some trans women report feeling more emotionally regulated on estrogen, not less controlled. The experience varies substantially by individual and context.
The pain framing is fair. Breast development soreness is a well-known side effect, and comparing it to puberty is actually a useful analogy since the underlying hormonal mechanisms overlap significantly.
What should you actually know?
If you're considering feminizing HRT, these three side effects are worth knowing about, but the individual variation is enormous. Muscle loss is real and supported by evidence, but it does not happen uniformly or at the same rate for everyone. Resistance training during HRT transition can significantly slow lean mass loss, which she does not mention.
Emotional changes are real but not always in the direction people expect. Some individuals report feeling emotionally clearer. Others report increased sensitivity. Neither experience is wrong. What the research shows is that estrogen does change emotional processing at a neurological level, not just a social one.
Pain during transition, particularly breast soreness, is common and typically temporary. If someone experiences severe or persistent pain on HRT, that warrants a clinical conversation, not just acceptance as normal puberty discomfort.
One thing this video does well: it normalizes side effects without catastrophizing them. That is genuinely useful for people starting this process who may have no community context for what to expect. However, personal experience on TikTok is not a substitute for individualized clinical guidance. Hormonal therapy is complex, and responses vary based on genetics, baseline hormone levels, dosing protocols, and other factors.