Pulsating, non-painful continual throbbing lower right abs

[JamesAA]

It's happend before and it's happening again this week, on and off.   This totally bizarre pulsating sensation (very noticeable but NEVER painful) around the scar from my appendectomy (which was many years ago).  That is, just south and to the right of the navel.  It's VERY rhythmical too, like a steady 75 bpm.  But it is NOT in sync with my HR so I doubt it's AAA (abdominal aortic aneurysm).  

It can beat uncontrollably and steadily for 10 minutes.  Typically it will go for a few minutes, then stop for a bit, then start back up.  Usually after 2-4 days it disappears til the next time, which could be months.  Currently I've had this since early Sunday morning.  

Nothing else too out of the ordinary this week with symptoms.  I feel fine.  But this pulsing is super annoying and rather uncomfortable (without being painful, if that makes sense).

Any ideas wtf this is???  I figure it's my colon/large intestine but I really don't know.  And if it is the colon what is making it pulse/jack-hammer like that?  

Oh and when it's happening you can actually look at the skin around that area and see it pop up and down, up and down.  It's freaky!!!  I hate it.  But again, zero pain.  

[JamesAA]

Hello and thank you for your comments Arti.  It seems as if it's intestinal related.  Can the intestine pulsate like this?  The pulsing is rhythmic, however it is NOT in sync with my heart rate...different rate entirely.  There is never pain either.  Most of the time this symptom is not present, but every once in a while there will be 2-5 days (or a little more) where throughout the day it will pulsate for several minutes at a time.  

I have no family history of aneurysms, I don't smoke and I am not diabetic.  

[Arti Sharma, M.D.]

Hi there,
Hope you are doing well. A physical examination and tests are must for correct diagnosis and management of your condition. A family history of aneurysm, smoking, diabetes, hypertension are few risk factors of this condition. Aneurysms are usually asymptomatic but there may be pain and throbbing in few cases which can indicate that it is likely to rupture. Tests like magnetic resonance imaging (MRI)/computerized tomography may be helpful. Consult a physician and get evaluated.
Best wishes and regards!