Good to get checked out, but likely just constipated. It’s amazing as we get older (30+) how even simple conditions can cause extreme uncomfortableness, pain, exhaustion, nausea, etc. If he is indeed just constipated, tell him to eat 1-2 Larabars a day for fiber. I eat them cuz gluten-free, but my hubby eats for regular pooping! Delicious & healthy too!👍