May
now i know this is a really weird question for a lad to be asking but i was just wondering.
Answer:
Good question to ask young man!
It goes without saying that the more massive the breast the heavier they would be.
Obviously, to an extend, young chest muscles would support small breasts quite adequately so, to the bearer they shouldn't feel heavy. Due to hormonal changes in woman, the fatty tissue in breasts absorbs fluid (water) and they do become heavier for a while, before they reduce again. As chest muscles become weaker with age and they stretch, they are less supportive to breast tissue and breasts start to 'sag'. This makes breasts feel heavier because they hang.
Bigger breasted ladies know only too well the pain and strain put onto neck, shoulder and back muscles due to heavy breasts.
To answer your question: Big breasts are very heavy on your chest.
Answer:
it depends on the size. if a woman's breasts are a size A then they probably won't be heavy. if she’s a DD then i am sure she will feel them there. get what i mean?
i am a size C and i don't think about them heavy. our back probably adjusts to the weight.
Answer:
well, not if they're small. but as you go up in size they get larger, but you get support bras that make it superior.
there was this woman who's boobs were so massive she has back problems! 
pain in the a s s at sports though.
Answer:
well My m8s have large boobs and she said she gets back ake so id state big ones are heavy because they have more fat in them were as smaller 1s are a lot lighter medium are just medium lol hope ive helped x
Answer:
No, not to me anyways, depends if you're little or trim and have a huge chest then they probs feel heavy cos they can give you backache
Answer:
If you’ve the inflatable kind, they’re quite light.
Answer:
Depends on their size. They can be. I mean, I can definitely tell mine are there. That's what a good bra is for.
Answer:
Well i am 16 and am a 34E! Yea and i know that they’re there!
Answer:
its part of their body so it will not have any effect on their body.
does your penis make it heavy for you…………..he he he
Answer:
ROFL!!!!!!!!!
Answer:
No, lol