Can social media and short-form content cause hypertension?
We all know these social and short-form content platforms are exploiting our attention for ad views and private information. However, the greater harm might be the addictive side of it. "Dopamine rushes" I mean.
I don't want to jump to conclusion but recently I've noticed the trend of increasing cases where people get heart diseases, kidney failure, hypertension, etc in my country (at very young age, below 30). Could it be that not only these platforms are harmful in mental health and privacy but also physical health?
Your English is mostly perfect, but (and as someone who tries, like you, to speak another language correctly):
Could it be that not only these platforms are harmful in mental health and privacy but also physical health?
should be
Could it be that not only are these platforms harmful in mental health and privacy but also physical health?
The change in location of the word are is what makes it a grammatically correct question rather than a statement.
To me, I think the primary harm to our physical health IS the impact on our mental health, which is a physical health. To say nothing of neglecting our physical bodies by being so sedentary.