Recently I've noticed that I would start getting a weird pain on my right side near the lower rib cage about halfway into muay thai training. At first I thought it was just side stitch or maybe too much water right before I started. But then the next day while just walking around normally I felt a slight pain again. I continued to work out my normal schedule 3-4 times per week and I noticed I got fatigued a lot sooner than normal and the weird pain would come around immediately after warm ups (repeating alternating left/right roundhouse kicks on heavy bag). The best way to describe the feeling is it feels exactly like side stitch (the abdominal pain/cramp you get while running) and it will eventually go away if i work through the pain. It is not intense pain but it does affect me mentally and disrupts my breathing. Has anyone else experienced this type of pain? I associate it with Muay Thai because when I train only boxing (no kicks) I do not get the pain unless it was already there, and my non combat workouts (cardio/weights/situps/etc) do not bother me. I was not hit there directly so it was not due to any trauma. I took a week off and it went away but low and behold, my 3rd day back training it started to come back. Do any of you think may be I'm breathing wrong during kicks? I have a bad habit of not breathing during some of my kicks and especially during combos involving kicks. Any advise or shared experience with this is appreciated.