Why do i constantly feel like i have phlegm in my throat? there is always mucus in my nose and throat and sometimes it affects my sleep.

Phlegm: You and 31 million other persons have this. Fancy name is mucociliary clearance - look that up. Your nasal cilia are not doing their job of moving bacteria out of the nose/sinuses. try Humming - low tone like "ooommmm" and songs Drink green tea warm, not too hot Increase fluid intake if not clear, consider pulsed nasal/sinus irrigation to restore good cilia movement. (see Hydro Pulse™)

Too many: There are too many answers to "why" to be able to answer here. Some causes are dental but most are classified as medical. Take advantage of the training and experience of an Otolaryngologist, an ear/nose/throats specialist to start the diagnostic process. You will have to be physically examined as the first step in this process. Go see a Pro now.

Lifestyle change: Avoid all milk products since the milk protein causes respiratory tract inflammation. Also avoid grains, lentils. Consume vegetables, flesh foods, olive oil. Get30 -45 min of sunshine at noon daily or taking vitamin D3 10,000 IU/day and take a good probiotic (not yogurt) to help reduce inflammation Yoga breathing exercises 10-30 min/day help. You should notice a significant improvement in 4-6wk