I'm visibly pregnant and it's quite dire in this heat, especially since I've still got horrendous HG and a split pubic bone.
DFriend was shocked to learn I don't ask for seats on the tube. She says "
Why wouldn't you ask someone perfectly capable of standing to give up their seat, politely?"
My thinking is because not all illnesses are visible, are they? Priority seating isn't just for the pregnant, is it?
I have Lupus syndrome and had a horrendous joint flare around 18 months ago. It was often so painful I'd wince at times. I looked perfectly fit and healthy and would've felt so bad looking at a pregnant lady stand, but none the less wouldn't have given one up if I was in need 
AIBU about this? No one on the tube really offers seats, and if they do they're usually men!
No offence taken though, or should I be angst like DFriend suggest?