HI,Dear, Thanks for the query from you for your dad.1-Though you didnt update the age of your dad and didnt update how many winters he is being having these chest pains-1-a-From the facts told by You, and In my opinion -your father , who is having frequent chest pains during winters specially,is really serious case of chest pain and was lucky to enjoy the bygone winters by the grace of GOD,1-b-Though your tmt came out to be mild, you should take it seriously,as the test give just a guide line of the internal changes, but the duration for which your father had chest paint, indicate that his heart has a seriously compromised blood supply.2-So my caution and advise to you is that you should take your fathers chest seriously, and go to ER physician or cardio-specialist and get his -Angiography- done to judge the severity and extent of the compromised heart blood supply, 2-a-and if the your ER cardio-advises andy corrective stent and angioplasty, plz get it done ASAP, to add more healthy life and to add active yrs to his old-age llife. -3-And as it is hearting him in every winter , you should take my CAUTIOUS-ADVISE very seriously-to save his life URGENTLY, though his tmt report is mild.3-Still in the meanwhile-get some anti-anginal drugs with the advise of ER physician-but dont depend on it to delay further CAutious-Treatments any more.4-So- I would advise you to URGENTLY check up with the local ER Cardio- doctor and to get it treated ASAP-urgtly.4-Hope this would solve your query.5-Wellcome to HCM for any more query.