| | Conditions & Treatments | Cold & Flu Can too much protein cause cold sores? No, there is no evidence that eating too much protein can cause cold sores. Cold sores are caused by the herpes simplex virus. Cold & Flu - Related Articles How to Make Saline Nose Rinse How to Get Rid of Chronic Sinus Congestion How to Stop a Cold Sore With Aspirin Should you get shingles vaccine when have shingles? Expectorant Vs. Decongestant How to Cough Up Mucus What are some of the symptoms a head cold?