Coughing up very smelly particles in the throat as white particles with the foul odor of rotten eggs is usually tonsil stones. Tonsil stones are chronic inflammation repeated stimulation, resulting in the increase of the tonsil crypts, in the tonsil crypts there are pathogenic bacteria, if you eat food debris into the tonsil nest residue, after a long time the residue within the inorganic material will be deposited to form stones. When coughing and swallowing the stones may be dislodged feeling foul smelling particles. Treatment of stones: 1, you can use antibacterial mouthwash to gargle; 2, you can ask the doctor to pick out the stones; 3, stubborn stones can be treated by tonsillectomy.