Abdomen pain on lower left side...?

My brother said he had sex last night. He now has problems with his* lower left abdomen hurting. The pain is dull, and doesn't radiate or anything. It's about a 5 or 6 on the pain scale. He said he noticed it when he went to use the bathroom, and it started hurting. It only hurts when he flexes his stomach... show more My brother said he had sex last night. He now has problems with his* lower left abdomen hurting. The pain is dull, and doesn't radiate or anything. It's about a 5 or 6 on the pain scale. He said he noticed it when he went to use the bathroom, and it started hurting. It only hurts when he flexes his stomach muscles for something or touches the area. The sex part was threw in becasue he said he doesn't have sex that much. It's not apendacitis because it's the opposite side.
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