Sometimes when i eat i get these very small fluid filled bumps inside my mouth on the smooth tissue. it doesn't hurt. what is this and what causes it?

Most Probably: You are dealing with small blocked salivary glands, or small salivary duct cysts. These are completely benign and are just a small (.

Bumps: Can be benign Fordyce Granules (sebaceous glands), blocked minor salivary glands, or a whole host of other problems. You will have to be seen to be evaluated. Call your Dentist to make arrangements to stop in to see him/her when the lesions are present.