Mouth sores are not a listed side effect of Ritalin. However, taking a stimulant medication such as Ritalin can cause dry mucus membranes in the mouth. In certain people, dry mouth may lead to sores. Biotene is a mouthwash which helps with dry mouth.
Cold sores are caused by herpes virus.
Ritalin can cause dry mucous membranes.
Peptic Ulcers
Cold sores are caused by herpes simplex virus. It is possible to get oral herpes from someone's genitals or fluid that comes into contact with genital mucous membranes (i.e. sperm) "Genital Herpes is contagious via mucus membranes, found in the mouth, genitals, nose, eyes and anus. They contain a thick liquid in which Genital Herpes travels. Sperm and vaginal fluids will usually be mixed with the fluids from mucus membranes."
Ulcerative Colitis causes chronic inflammation of the large bowel with open sores of mucous membrane
Chlamydia does not affect your lips. You can get chlamydia infection of the throat, though.
Pickles don't cause cold sores.
Ambien doesn't cause canker sores.
Almonds don't cause cold sores.
Herpes and syphilis are STDs that can cause sores on the mouth or genitals (or anywhere else).
Eating chili doesn't cause cold sores.
An asthma inhaler doesn't cause cold sores.
Unhealthy teeth doesn't cause you to have cold sores.
Yes stress DOES cause cold sores. I hope this answers your question.