It doesn't for me

Noooo definitely not. I started a known POTS exercise program with a neurological PT. All of the exercises for the first few months were supine and I had to stop any time my heart went over 100 BPM (usually like 4 leg lifts). I even felt bad after that, so I can’t imagine what cardio would do to my body 😥

I adore cardio but it usually makes my symptoms worse. 😥

It all depends on what your doing, light cardio helps a lot of people with Pots but nothing super rigorous. Go on walks or a very light jog. No squats or anything with a lot of up and down movement as that normally worsens symptoms. I do a lot of chair or laying down exercises, or lifting small weights while I'm sitting.