Chronic Exertional Compartment Syndrome CECS this can cause pain in your legs, or your arms, or even your abdomen when you exert yourself. Overexercising can cause swelling in limbs and then pressure on arteries. This can then slows the flow of blood and the muscles become painful.

Here is a great link from Mayo Clinic. CECS.

The diagnosis is difficult as you need to be exercising, then have the symptom, and then immediately have pressure tests done, usually like blood pressure readings comparing limbs.

Take care

Judy