I lied at MEPS. Will they go back and look through my medical records?

I agree with the LTC. Be careful of ANYTHING that you decide to put on the internet!! It will always come back to bite you in the ass.
Starting to build an initial background with the military of your choice is a great piece of your personal history. It can augment your resume as well as your future personality when in groups of other friends.
However, if you begin that part of your future with a lie, it can create extremely disastrous repercussions IF (because of the lie) another service member is harmed or killed, due to a major problem initiated by your heart issue!! "THAT" will not only follow your (for the rest of your life) but can get you DD.
You will be required to 'swear an Oath' based on the Constitution of these United States! DO NOT TAKE THAT LIGHTLY.

MEPS will check all of your medical records, since you stated that you lied to them on a public website it could be cause for providing false and misleading information to a government agency. The best thing to have done was to be honest in the first place.

Well, I was a Navy Brat, so I owned up to everything. Due to the Navy having my records already.

How are you suppose to remember a medical condition you were told at 6 years old and never mentioned again

I don't think they will unless you screw up somewhere and they go digging through all of your records. BTW, don't ever lie again if you are in the military.

Buddy, you are admitting what? You may need legal help. You may want to keep my website handy muhammadshaheed.wearelegalshield.com

Integrity......might want to look that up.

Duffle blog, great material here for ya!

Everyone has lied at mepps. You think no one has ever done any weed before. The trick is to never admit and deny deny deny.

Firstly, posting publicly was dumb and I’d delete your question ASAP. Secondly, yes they can and will. One of my friends lies on his MEPS for the Marine Corps and almost got PRB’d out of the program. Luckily he stayed in the program because the medical issue was minor. A heart murmur isn’t a minor thing, especially in a military setting where sudden, unprovoked, high levels of stress is a commonality. By lying about having one you not only put yourself at risk, but you are making your future command and unit liable for your safety. I hope you understand that if you drop dead from this, several good men will lose their careers over it. Make sure your doctor clears you and don’t lie in the future, first thing you’ll learn in the military is integrity.