Hello My Husband Has Been Complaining About His Stomach For

Hello my husband has been complaining about his stomach for the past few days. He has been having alot of bowel movements more than normal. Tonight I saw what it looked like. It was brown but flaky like pieces. The other day he said it was green but I can't remember if he told me it was flak, runny or whole. He also complained about his side bothering him to day to where it's uncomfortable for him to breath