Is it possible to have both a Hiatal hernia and an abdominal hernia from a pregnancy?

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In general, a tummy tuck including the tightening of the abdominal muscles may very well make the symptoms of your hiatal hernia worse.

Sadly, pregnancy both makes your tissues stretchy and puts a lot of pressure on them at the same time from the growing baby. Hernia are holes in the abdominal cavity that can then develop where abdominal contents (like bowel) can pop through. Umbilical hernia, the most common hernia to occur with pregnancy, is pretty easy to see because your belly button becomes an "outie" that you can push in, then it pops out again! A hiatal hernia, on the other hand, is your upper stomach and esophagus popping into your chest cavity, and is usually associated with reflux. This is not always obvious, you may just have reflux - usually your gastroenterologist can diagnosis it (with a barium swallow or upper scope). Fixing a small abdominal hernia (like your umbilical hernia) is unlikely to cause worsening of your hiatal hernia. If your PS does a large rectus diastasis, ie, tightens up your abdominal wall, it can put pressure upwards on your hiatal hernia and make you feel tighter and more "full". Best to figure out what you have and how best to treat it before going into any cosmetic surgery.

A hiatal hernia is an internal hernia in which the upper portion of the stomach proturds through the diaphragm. It is unrelated to an external hernia, like umbilical or inguinal hernia, and there is no interference with any cosmetic surgery procedure.

I agree with the answers of the two previous PS so I would not be afraid to procede with the planned abdominoplasty

There is no safety issue in doing a TT with a hiatal hernia, but it can definitely make the Hiatal Hernia symptoms worse. You need to get a consultation from a general surgeon first before undergoing a TT.