Husband Age 63 Excellent Condition In The Evening Following Weight

Husband age 63 excellent condition in the evening following weight lifting at gym complaining of chest tightness. This morning he had congestion and was expressing mucus. He took colloidal silver and no longer has this symptom. Chest tightness gone, now has dull pain if he bends over (puts head below waist). The discomfort is just below his right breast in the rib area. If he is sitting or standing no discomfort. Would it be fair to assume he is having muscle pain from his work out at the gym? Work out was about 29 hour ago.