Why are my veins showing through my skin in my abdomin, chest? The veins are very dark and transparent. I have just been diagnosed with having a very high level of ammonia in my liver , blood stream. I am having an exteme hard time breathing. Last Wednesday I went to the Dr and I also have Bronchitis ,, I just finished a perscription of the Z-Pac. I m in a lot of pain in my mid section, and can not breathe .