The doctor said i have post nasal drip.can the bumps on the back of my tongue be from post nasal drip and mucus build up. the bumps are way in back?

Possibly: The bumps on the back of your tongue may be irritated papillae (normal) or they may be an enlargement that needs to be evaluated by your dentist or family physician. To be safe, make an appointment with either one.

Circumvallate papill: These bumps are normal anatomy and are called circumvallate papillae. They can become slightly enlarged if you get sick.

Tongue scraper: Those bumps are naturally occurring and can become enlarged when feeling sick. Any drainage in the back of the throat can rest on these bumps and can cause bad breath. Food can also collect on these bumps and can cause halitosis. A tongue scraper is an effective tool to clean those mushroom shaped bumps, and your tongue houses a lot of bacteria. A toothbrush can do an effective job also.