Worried About These Two Knot Like Feeling Things in My Pectoral Muscles

[bengalsreds20]

In addition to the struggles I've been having with constipation, I have what feel like hard muscles that feel kind of like they are knots.  They really aren't knots they're more like a hard muscle if that makes any sense.  They are on both sides so maybe I'm just feeling a muscle, but the one on the left is a little harder feeling.  They don't hurt to touch or anything, but when I'm trying to relax them they make like a popping noise.  I can't get it out of my head that they're probably just muscles, I'm thinking they're like a tumor or something and they're worrying me to death.  I can't relax because one thing goes away and a new thing just comes up, it's so frustrating.

[bengalsreds20]

They really aren't in my pectoral muscles they're further up in my chest area a little below my shoulders.