One thing to consider is that it is colon related.
As we get get older, due to lack of fiber in most of our diets, we tend to develop pockets in the left side of our colon (called diverticulosis). For the most part, diverticulosis does not cause any symptoms.
However, if one of these pockets becomes inflamed or infected, it causes pain in the left lower abdomen and tenderness to palpation (pushing on the area). Symptoms can range from mild pain to severe pain, nausea and vomiting and fever.
An inguinal hernia is a second possibility. If you notice any bulging in the groin area, this would be the likely cause.
Third possibility is a kidney stone. Kidney stones can start as back pain that radiate to the front of the abdomen and groin area. Usually the pain is quite severe, though.
A urinalysis showing microscopic blood would be indicative of a potential stone.
If your pain is increasing, you should have your doctor do an exam to rule out diverticulitis (infected pocket). This would be treated with antibiotics.
Try to schedule your colonoscopy--so important and can be a life saving procedure.
Also a urinalysis should be considered.
I hope this gives you some ideas as to potential causes other than muscle.
Feel free to ask any follow up questions you may have,
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