Keeping the Qur'an behind one's back

Q: I have noticed in some parts of the world e.g. Pakistan, they lay great importance on not having the Quran behind ones back, to the extent that even if you are at the back of a small musjid and are reading Quran and someone in the first saff is directly in front of you, they would tell you to move and get very angry about it. On the other hand in many other countries sitting directly behind someone's back and reading Quran is not considered wrong. What is mufti sahebs view on this matter of the Quran behind the back?

Wearing underwear under the ihraam for medical reasons

Q: Recently I underwent and operation for hydrocele in India and came back to jeddah and Joined duty. Now I want to perform umrah, but the problem is I have to wear ihraam towel as per quran and sunnah. Now my question is can I wear underwear under the ihraam otherwise I will feel pain for tawaaf and sa'ai and may cause complications. So please advise me according to quran and sunnah what shall I do?