During meditation in past, it was observed that if focus is maintained on nostrils, tip of nose and center of forehead(between eyebrows) then it causes cold and cough within 2-3 days of such practice.
Surprisingly, it was observed whenever it was practised.
Tried the same experiment with other fellows at that time, they also had same symptoms, if not sooner then later.
In tipitaka, anywhere mentioned about ill-effects of such combination of meditation focus points?
Are these ill effects or could be something else, not taken into consideration?
Analysis so far-
Kayanupashyana and vednanupashyana both are all about focus, observe, analyse body parts (though not always at single area but bit by bit within whole body). There might be somewhere mentioned about such ill effects, if not then either those suttas were burned off or this assumption is wrong or assumption is correct & it might be due to wrong concentration & observation, "upward air entering as cold & sensing nose part nearby forehead leading to formation of runny nose, cold, cough"