For last 4-5 months, most of the days after my first meal(lunch), i feel a sudden urge of bowel after 10-15 mnts. the stool is mostly mushy, some mucus, pungent, yellow, some foams. the morning bowel is fine not really loose.. anything serious ?

See ur doctor: Change in bowel habits common, but shouldn't linger months. Common causes: lactose intolerance (from cow milk and products), alcohol/caffeine, artificial sweeteners, food allergies (even without hives), and many medications. But other causes e.g. viral/parasite (like Giardia), irritable or inflammatory bowel, pancreas insufficiency etc. Should see MD - esp. sooner if blood, fever, pain, nausea etc